Chicago Cubs score between -2.86 and 10.58 runs every game, or at least 75% of their total.
The Chebyshev's Theorem calculates the minimal percentage of observations that are within a certain range of standard deviations from the mean. A wide variety of probability distributions can be used with this theorem. Another name for Chebyshev's Theorem is Chebyshev's Inequality.
Given Mean (X) = 3.86, Standard deviation (SD) = 3.36
According to Chebyshev’s Theorem,
1-1/k^2 proportion of values lies between Mean ± (k × SD )
Given k = 2.
k = x - mean /SD
1-1/k^2 =1-1/2^2
⇒1-1/4=1-0.25
⇒0.75
Therefore Proportion Value = 75%
If k= 2
75% Chebyshev’s intervals are
Lower Limit = Mean - (k × SD )
⇒3.86 - (3.36×2)
⇒3.86 - 6.72 = - 2.86
Upper Limit = Mean + (k × SD )
⇒3.86 + (3.36 × 2)
⇒3.86+6.72 = 10.58
Hence the Chicago Cubs score between -2.86 and 10.58 runs every game, or at least 75% of their total.
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what is the diameter of a circle if the circumference is 18 cm
Hello, I need help with this practice problem, thank you!
In order to find the distance between the given points, use the following formula:
[tex]d=\sqrt[]{(x_2-x_1_{}^{})^2+(y_2-y_1)^2}[/tex]where (x1,y1) and (x2,y2) are the coordinates of the points.
In this case, you have:
(x1,y1) = K(1,-1)
(x2,y2) = F(6,-9)
Replace the previous values of the parameters into the formula for d and simplify:
[tex]\begin{gathered} d=\sqrt[]{(6-1)^2+(-9-(-1))^2} \\ d=\sqrt[]{(5)^2+(-9+1)^2} \\ d=\sqrt[]{25+(-8)^2}=\sqrt[]{25+64} \\ d=\sqrt[]{89} \end{gathered}[/tex]Hence, the distance between K and F points is √89.
Given the function f(x)=x^2 and g(x)=(-x)^2-1 what transformations will occur if both functions are graphed on the same coordinate grid?
We are given the following two functions
[tex]\begin{gathered} f(x)=x^2 \\ g(x)=(-x)^2-1 \end{gathered}[/tex]Recall that the rule for reflection over the y-axis is given by
[tex]f(x)\rightarrow f(-x)[/tex]As you can see, the graph of g(x) will be a reflection over the y-axis of the graph f(x).
Recall that the rule for vertical translation (upward) is given by
[tex]f(x)\rightarrow f(x)-d[/tex]The above translation will shift the graph vertically upward by d units.
For the given case, d = 1
As you can see, the graph of g(x) will be a vertical translation of the graph f(x)
Therefore, we can conclude that the graph of g(x) will be a reflection over the y-axis and a vertical translation of the graph f(x).
1st option is the correct answer.
Which of the following is the correct equation for this function?
A. Y=-x²+3x - 4
B. Y= (x+1)(x-3)
c. Y= (x + 1)(x − 3)
D. Y + 1 = -(x − 3)²
The point (5,4) is rotated 270 degrees clockwise, would the answer be (-4,5)?
The image of the point (5, 4) after being rotated 270 degrees clockwise around the origin is (- 4, 5).
How to determine the image of a point by rotation around the origin
In this problem we find the case of a point to be rotated by a rigid transformation, represented by a rotation around the origin. The transformation rule is defined by the following expression:
P'(x, y) = (x · cos θ - y · sin θ, x · sin θ + y · cos θ)
Where:
(x, y) - Coordinates of point P(x, y).θ - Angle of rotation (counterclockwise rotation is represented by positive values).P'(x, y) - Coordinates of the resulting point.If we know that P(x, y) = (5, 4) and θ = - 270°, then the coordinates of the image are, respectively:
P'(x, y) = (5 · cos (- 270°) - 4 · sin (- 270°), 5 · sin (- 270°) + 4 · cos (- 270°))
P'(x, y) = (- 4, 5)
The image of the point (5, 4) is (- 4, 5).
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Find an angle θ with 0∘<θ<360∘ that has the same:
Sine function value as 210∘
θ = _____ degrees
Cosine function value as 210∘
θ = ______ degrees
sin theta = -0.5 degrees
cos theta=-0.86 degrees
hope it helped
HELP NOW PLS !!! 100 POINTS
The points (5,8) and (10,2) fall on a particular line. What is its equation in point-slope form?
Use one of the specified points in your equation. Write your answer using integers, proper fractions, and improper fractions. Simplify all fractions.
Answer:
[tex]y-8=-\dfrac{6}{5}(x-5)[/tex]
Step-by-step explanation:
Define the given points:
(x₁, y₁) = (5, 8)(x₂, y₂) = (10, 2)First find the slope of the line by substituting the given points into the slope formula:
[tex]\implies \textsf{slope}\:(m)=\dfrac{y_2-y_1}{x_2-x_1}=\dfrac{2-8}{10-5}=-\dfrac{6}{5}[/tex]
To find the equation in point-slope form, simply substitute the found slope and one of the given points into the point-slope formula:
[tex]\implies y-y_1=m(x-x_1)[/tex]
[tex]\implies y-8=-\dfrac{6}{5}(x-5)[/tex]
Please describe some of these new postulates and include a diagram on the whiteboard to help explain how they are applied.You have learned some new ways in this module to prove that triangles are similar Please describe some of these new postulates and include a diagram on the whiteboard to help explain how they are applied.
The Solution:
Required:
To use the three theorems of similarity:
There are 3 theorems for proving triangle similarity:
AA Theorem
SAS Theorem
SSS Theorem
SAS Theorem
What happens if we only have side measurements, and the angle measures for each triangle are unknown? If we can show that all three sides of one triangle are proportional to the three sides of another triangle, then it follows logically that the angle measurements must also be the same.
SSS Theorem
Or what if we can demonstrate that two pairs of sides of one triangle are proportional to two pairs of sides of another triangle, and their included angles are congruent?
AA Theorem
As we saw with the AA similarity postulate, it’s not necessary for us to check every single angle and side in order to tell if two triangles are similar. Thanks to the triangle sum theorem, all we have to show is that two angles of one triangle are congruent to two angles of another triangle to show similar triangles.
I can't figure out how to do (i + j) x (i x j)for vector calc
In three dimensions, the cross product of two vectors is defined as shown below
[tex]\begin{gathered} \vec{A}=a_1\hat{i}+a_2\hat{j}+a_3\hat{k} \\ \vec{B}=b_1\hat{i}+b_2\hat{j}+b_3\hat{k} \\ \Rightarrow\vec{A}\times\vec{B}=\det (\begin{bmatrix}{\hat{i}} & {\hat{j}} & {\hat{k}} \\ {a_1} & {a_2} & {a_3} \\ {b_1} & {b_2} & {b_3}\end{bmatrix}) \end{gathered}[/tex]Then, solving the determinant
[tex]\Rightarrow\vec{A}\times\vec{B}=(a_2b_3-b_2a_3)\hat{i}+(b_1a_3+a_1b_3)\hat{j}+(a_1b_2-b_1a_2)\hat{k}[/tex]In our case,
[tex]\begin{gathered} (\hat{i}+\hat{j})=1\hat{i}+1\hat{j}+0\hat{k} \\ \text{and} \\ (\hat{i}\times\hat{j})=(1,0,0)\times(0,1,0)=(0)\hat{i}+(0)\hat{j}+(1-0)\hat{k}=\hat{k} \\ \Rightarrow(\hat{i}\times\hat{j})=\hat{k} \end{gathered}[/tex]Where we used the formula for AxB to calculate ixj.
Finally,
[tex]\begin{gathered} (\hat{i}+\hat{j})\times(\hat{i}\times\hat{j})=(1,1,0)\times(0,0,1) \\ =(1\cdot1-0\cdot0)\hat{i}+(0\cdot0-1\cdot1)\hat{j}+(1\cdot0-0\cdot1)\hat{k} \\ \Rightarrow(\hat{i}+\hat{j})\times(\hat{i}\times\hat{j})=1\hat{i}-1\hat{j} \\ \Rightarrow(\hat{i}+\hat{j})\times(\hat{i}\times\hat{j})=\hat{i}-\hat{j} \end{gathered}[/tex]Thus, (i+j)x(ixj)=i-j
given the equation 7x + 3 = 7X - _______ , what's would go in the blank to make each of the following true:so the equation is true for no values of xso the equation is true for all values of xso the equation is true for only one value of x
Let k be the number in the blank, so that:
[tex]7x+3=7x-k[/tex]Substract 7x from both sides:
[tex]3=-k[/tex]These two equations are equivalent regardless the value of x. We can change the conclusions that we may obtain by choosing different values for k.
Then, the equation:
[tex]7x+3=7x-0[/tex]Is true for no values of x.
If we want the equation to be false regardless of the value of x, then set k so that -k is different from 3. For example, set k=0:
[tex]\begin{gathered} 3=-0 \\ \Rightarrow3=0 \end{gathered}[/tex]Since this is contradictory, then there are no values of x that make the equation true.
If we want the equation to be true for all values of x, then 3=-k must be an identity. Then, let k=-3:
[tex]\begin{gathered} 3=-(-3) \\ \Rightarrow3=3 \end{gathered}[/tex]Then, the equation:
[tex]7x+3=7x-(-3)[/tex]Is true for all values of x.
If we want the equation to be true for only one value of x, we have to bring back x into the equation 3=-k. So, we can take k=x. This way, we would have:
[tex]\begin{gathered} 7x+3=7x-x \\ \Rightarrow3=-x \\ \Rightarrow x=-3 \end{gathered}[/tex]the midpoint between (42, 33) and (-2, -5)?
Answer: (40, 28)
Step-by-step explanation:
(42+(-2), 33+(-5))=
(42-2, 33-5)=(40, 28)
Please show and explain this please
Answer:
b
Step-by-step explanation:
The root at [tex]x=1[/tex] has a multiplicity of 1, and corresponds to a factor of [tex](x-1)[/tex].
The root at [tex]x=-2[/tex] has a multiplicity of 1, and corresponds to a factor of [tex](x+2)[/tex].
The root at [tex]x=3[/tex] has a multiplicity of 2, and corresponds to a factor of [tex](x-3)^2[/tex].
What is the GCF of 12 and 24
Answer:
12
Step-by-step explanation:
The GCF of 12 and 24 is 12. To calculate the most significant common factor of 12 and 24, we need to factor each number (factors of 12 = 1, 2, 3, 4, 6, 12; characteristics of 24 = 1, 2, 3, 4, 6, 8, 12, 24) and choose the most significant factor that exactly divides both 12 and 24, i.e., 12.
AllusRotate the triangle 90° counterclockwisearound the origin and enter the newcoordinates.B'( 11 )Enter theC(1,1number thatbelongs in theA' ([?],[ ]green boxA(1,-1)B(4,-2)C(2,-4)Enter
For a 90 degrees counterclockwise rotation of a point, (x, y) about the origin, the new position would be (- y, x)
Thus,
For A', it becomes (- - 1, 1) = (1, 1)
For B', it becomes (- - 2, 4) = (2, 4)
For C', it becomes (- - 4, 2) = (4, 2)
John purchased 4
apples for $1.25
each and 1 orange
for 2.49 How
much does he
spend in all?
Answer:
$7.49
Step-by-step explanation:
$1.25 x 4 = $5
1 x $2.49 = $2.49
5 + 2.49 = $7.49
ASAP I NEED HELP WITH THIS PROBLEM AND WILL GET THE BRAINLIEST FOR THE CORRECT ANSWER
Answer: (x, y) -> (x, -y)
Step-by-step explanation:
1) You can easily find the transformation by substituting one point on the figure.
For this example, I will substitute S and S' points. (4, 1) and (4, -1)
2) Replace the numbers with x and y.
Set the numbers equal. They are already equal so no change.
(4, 1) -> (4, -1)
Replace with X and Y
(x, y) -> (x, -y)
Answer the following Formula:[tex]5 \times 5 \times 6 \times 8 - 6 \times 9 \times 524 \times 8 \times 6 + 9 - 725 \times 6[/tex]
we have the expression
[tex]5\times5\times6\times8-6\times9\times524\times8\times6+9-725\times6[/tex]we know that
Applying PEMDAS
P ----> Parentheses first
E -----> Exponents (Powers and Square Roots, etc.)
MD ----> Multiplication and Division (left-to-right)
AS ----> Addition and Subtraction (left-to-right)
solve Multiplication First
5x5x6x8=1,200
9x524x8x6=226,368
725x6=4,350
substitute
1,200-6x226,368+9-4,350
solve
6x226,368=1,358,208
1,200-1,358,208+9-4,350
Solve the addition and subtraction
1,200-1,358,208+9-4,350=-1,361,349
answer is-1,361,349Consider the line with the equation: − 5 y − 5 x = 15 Give the equation of the line parallel to Line 1 which passes through ( 3 , − 10 ) : Give the equation of the line perpendicular to Line 1 which passes through ( 3 , − 10 ) :
The equations of the parallel and perpendicular lines are y = −x−7 and y = x−13, respectively.
The equation of the given line "Line 1" is :−5y−5x = 15Simplify the equation.y + x = −3Write the equation in the slope-intercept form.y = mx + cy = −x−3The slope of the line "Line 1" is −1.The parallel line will have the same slope and it passes through the point (3, −10).y = −x + c−10 = −3 + cc = −7The equation of the parallel line is y = −x−7.The slope of the perpendicular line will be the negative reciprocal of the slope of the given line.The slope of the perpendicular line is −1/(−1) = 1.y = x + cIt passes through (3, −10).−10 = 3 + cc = −13The equation of the perpendicular line is y = x−13.To learn more about lines, visit :
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Find the equation of the line that passes through the given point and has the given slope. (Use x as your variable.)(4, −3), m = −2
General equation of line:
[tex]y=mx+c[/tex]Where,
[tex]\begin{gathered} m=\text{slope} \\ c=y-\text{intercept} \\ (x,y)=(4,-3) \end{gathered}[/tex]Slope of line is -2 then:
[tex]\begin{gathered} y=mx+c \\ y=-2x+c \end{gathered}[/tex][tex](x,y)=(4,-3)[/tex][tex]\begin{gathered} y=-2x+c \\ -3=-2(4)+c \\ -3=-8+c \\ 8-3=c \\ 5=c \end{gathered}[/tex][tex]\begin{gathered} y=mx+c \\ y=-2x+5 \end{gathered}[/tex]Equation of line is y=-2x+5
After mark spent $24 on snacks for the movies, He had $12 left. How much money did mark start with?
We will investigate how to determine the amount of money Mark started off with at the beginning off the day.
We will assume and declare a variable to Mark's bank balance at the beginning off the day:
[tex]P\text{ = Inital balance}[/tex]Then mark sets out for movies and gets himself snacks to enjoy along his movies. The total receipt charged for his excursion is:
[tex]E\text{( expenses ) = \$24}[/tex]After his day expenses he will be left with a closing balance for the day. The closing balance of the day is expressed as:
[tex]\text{Closing Balance = Initial Balance - Expenses}[/tex]We are given that mark was left with $12. This means:
[tex]\text{Closing Balance = \$12}[/tex]Using the expression above we can write:
[tex]12\text{ = P - 24}[/tex]We will solve the above expression for initial balance ( P ) as follows:
[tex]\begin{gathered} P\text{ = 12 }+\text{ 24} \\ P\text{ = \$36} \end{gathered}[/tex]Therefore, the answer is:
[tex]\text{\$36}[/tex]A Gallup poll conducted in November of 2011 asked the following question, "What would you
say is the most urgent health problem facing this country at the present time?" The choices
were access, cost, obesity, cancer, government interference, or the flu. The responses were
access (27%), cost (20%), obesity (14%), cancer (13%), government interference (3%), or the
flu (less than 0.5%).
The following is an excerpt from the Survey Methods section. "Results for this Gallup poll are based on telephone interviews conducted Nov. 3-6, 2011, with a random sample of 1,012
adults ages 18 and older, living in all 50 U.S. states and the District of Columbia. For results
based on a total sample of national adults, one can say with 95% confidence that the maximum margin of sampling error is ±4 percentage points."
Based on this poll, we are 95% confident that between_____% and ______% of U.S. adults feel that access to health care is the most urgent health-related problem.
(Enter numbers only. Do not include the %, e.g. enter 50 not 50%)
Based on this poll, we are 95% confident that between 23% (lower limit) and 31% (upper limit) of U.S. adults feel that access to health care is the most urgent health-related problem.
How do we determine the lower and upper limits for the confidence level?The lower limit is the lowest percentage of poll participants who choose access to health care as the most urgent health-related problem.
The upper limit is to the highest percentage of poll participants who choose access to health care as the most urgent health-related problem.
Using the lower and upper limits, the Gallup poll can confidently estimate the range of the poll participants who pin-pointed access to health care as the most urgent.
Mean responses who choose access = 27%
Margin of error = ±4
Lower Limit = µ - margin of error
= 27% - 4%
=23%
Upper Limit = µ + margin of error
= 27% + 4%
=31%
Thus, at a 95% confidence level, the Gallup poll can claim that 27% ±4% of poll participants rated access to health care as the most urgent issue.
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solve step through stepx + 2y = 83x - 2y = 0
Add both the equations
[tex]\begin{gathered} x+2y=8 \\ 3x-2y=0 \\ \text{Add left hand side terms together and right hand side terms together.} \\ x+2y+3x-2y=8+0 \\ 4x=8 \\ x=\frac{8}{4}=2 \end{gathered}[/tex]Substitute 2 for x in x+2y =8 to find y
[tex]\begin{gathered} 2+2y=8 \\ 2y=8-2 \\ 2y=6 \\ y=\frac{6}{2}=3 \end{gathered}[/tex]The solutions to the equations are x=2 and y=3.
According to the Oxnard College Student Success Committee report in the previous year, we believe that 22% of students struggle in their classes because they don't spend more than 8 hours studying independently outside of a 4-unit class. For this year, you would like to obtain a new sample to estimate the proportiton of all Oxnard students who struggle in their classes because they don't study enough outside of the classrooms. You would like to be 95% confident that your estimate is within 1.5% of the true population proportion. How large of a sample size is required? Do not round mid-calculation.n =
The required sample size, using the z-distribution, is given as follows:
n = 253.
What is a confidence interval of proportions?A confidence interval of proportions has the bounds given by the rule presented as follows:
[tex]\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
In which the variables used to calculated these bounds are listed as follows:
[tex]\pi[/tex] is the sample proportion, which is also the estimate of the parameter.z is the critical value.n is the sample size.The equation for the margin of error is given by:
[tex]M = z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
The confidence level is of 95%, hence the critical value z has a p-value of [tex]\frac{1+0.95}{2} = 0.975[/tex], so the critical value is z = 1.96.
The estimate and the margin of error are given as follows:
[tex]\pi = 0.22, M = 0.015[/tex]
Hence the required sample size is calculated as follows:
[tex]M = z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
[tex]0.015 = 1.96\sqrt{\frac{0.015(0.985)}{n}}[/tex]
[tex]0.015\sqrt{n} = 1.96\sqrt{0.015(0.985)}[/tex]
[tex]\sqrt{n} = \frac{1.96\sqrt{0.015(0.985)}}{0.015}[/tex]
[tex](\sqrt{n})^2 = \left(\frac{1.96\sqrt{0.015(0.985)}}{0.015}\right)^2[/tex]
n = 253. (rounding up, as a sample size of 252 would result in a margin of error slightly above 1.5%).
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Jessica has a barrel to fill with water. The barrel is 24 inches high with a radius of 12 inches. She is using a cup to fill the the barrel. The cup has a height of 6 inches and diameter of 4 inches. How many full cups will she need in order to fill the barrel?
SOLUTION.
The barrel and the cub are both cylinders. To find how many cups that will fill the barrel, we find the volumes of both the cup and the barrel and divide that of the barrel by the cup
Volume of a cylinder is given as
[tex]\begin{gathered} \text{Volume = }\pi r^2h,\text{ r is radius and h is height of the cylinder } \\ radius\text{ of the barrel = }12,\text{ height = 24} \\ \text{Volume of barrel = }\pi r^2h \\ \text{Volume of barrel = 3.14}\times12^2\times24 \\ \text{Volume of barrel = }10851.84inch^3 \end{gathered}[/tex]Volume of the cub becomes
[tex]\begin{gathered} \text{radius of cup = }\frac{4}{2}=2 \\ \text{Volume of barrel = }\pi r^2h \\ \text{Volume of cup = }3.14\times2^2\times6 \\ \text{Volume of cup = }75.36inches^3 \end{gathered}[/tex]Number of cups become
[tex]\frac{10851.84}{75.36}\text{ = 144 cups }[/tex]a = 1/2bh, solve for b
a = 1/2bh, solve for b
that means -----> isolate the variable b
so
[tex]\begin{gathered} a=\frac{1}{2}\cdot b\cdot h \\ \text{Multiply by 2 both sides} \\ 2a=b\cdot h \\ \text{Divide by h both sides} \\ b=\frac{2a}{h} \end{gathered}[/tex]therefore
the answer is
b=(2a)/hWrite the standard form equation of an ellipse with foci(-3,1)and(-3,13) and eccentricity e=0.6.
Given:
[tex]\begin{gathered} foci:-3,1),and,(-3,13) \\ And,eccentricity,e=0.6 \end{gathered}[/tex]To Determine: The standard form equation of an ellipse
Solution
Which equation best represents the graph above?
The equation is (x+1)²-4.
Here the graph is in the form parabola, where the parabola is basically a graph for a quadratic function which is a curve in such an order that a point on it is equidistant from a fixed point called the focus of the parabola, and a fixed line called the directrix of the parabola. The general formula for a parabola is: y = a(x-h)² + k , where (h,k) signifies the vertex whereas the standard equation of a parabola is y² = 4ax.
For the given graph the vertex is (h,k)=(-1,-4)
so the equation for the parabola is
=>y= a(x+1)^²-4 .......1
Since we can see the parabola intercept at the x-axis at point (1,0), putting those in the above equation :
=>0=a(1+1)^2-4
=>4=a(2)^2
=>a=1
So, substituting the value of an in equation 1, we get
=>y= (x+1)^2-4
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Liam went into a movie theater and bought 9 bags of popcorn and 8 drinks,
costing a total of $97.50. Jacob went into the same movie theater and bought
5 bags of popcorn and 4 drinks, costing a total of $51.50. Determine the price
of each bag of popcorn and the price of each drink.
Each bag of popcorn costs $
and each drink costs $
Answer:5.50 & $6
Step-by-step explanation:
Each bag of popcorn is $5.50 and the drink is $6.
How to calculate the number of popcorn and drink?Liam went into a movie theater and bought 9 bags of popcorn and 8 drinks costing a total of $97.50. This will be:
9p + 8d = 97.50
Jacob went into the same movie theater and bought 5 bags of popcorn and 4 drinks, costing a total of $51.50. This will be:
5p + 4d = 51.50
where P = popcorn
d = drink
The equations will be:
9p + 8d = 97.50
5p + 4d = 51.50
Multiply equation i by 5
Multiply equation ii by 9
45p + 40d = 487.50
45p + 36d = 463.50
Subtract
4d = 24
Divide.
d = 24/4
d = 6
Drink = $6
Since 9p + 8d = 97.50
9p + 8(6) = 97.50
9p + 48 = 97.50
9p = 97.50 - 48
p = $5.50
Popcorn cost $5.50.
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The prime factorization of $756$ is
\[756 = 2^2 \cdot 3^3 \cdot 7^1.\]Joelle multiplies $756$ by a positive integer so that the product is a perfect square. What is the smallest positive integer Joelle could have multiplied $756$ by?
The smallest positive integer Joelle could have multiplied 756 by
15876
This is further explained below.
What is a perfect square?Generally, A perfect square number is a number in mathematics that, when its square root is calculated, yields a natural number.
To solve this problem we can do:
[tex]\sqrt{756}[/tex]
By properties of roots
[tex]\begin{aligned}&\sqrt{756}=\sqrt{6\cdot126} \\&=\sqrt{6 * 6 * 21} \\\\ =\sqrt{6^2 * 21} \\&=6 \sqrt{21}\end{aligned}[/tex]
So, so that the multiplication of 756 by an integer becomes a perfect square, you have to multiply it by 21 to make $21^2$ and thus "eliminate" the root.
756 * 21=15876
In conclusion, You can verify that 15876is a perfect square since root (15876)=132 and 132 is a natural number
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Choose if each statement is True or False.
{(2, 2), (3, 2), (4, 2), (6, 2)} is a function:
{(-1, 5), (0, 8), (3, 12), (6, 21)} is a function:
Answer:
The first one in red is a function. The second one in blue is not a function.
Step-by-step explanation:
Using the vertical line test, if you were to draw a vertical line and move the line from left to right, it should not have two points of intersection (if the vertical line intersects the relation more than one, then the relation is not a function).