Question

a data set consists of the following data points: (3,5),(5,8),(6,13)
the line of best fit has the equation y = 2.5x - 3. what does this equation predict for a value of x = 3?
a. 9
b. 7.5
c. 6
d. 4.5

Explanation:

Step1: Substitute x value

Substitute $x = 3$ into $y=2.5x - 3$.
$y=2.5\times3 - 3$

Step2: Calculate the value of y

First, calculate $2.5\times3 = 7.5$. Then $y=7.5 - 3$.
$y = 4.5$

Answer:

D. 4.5