Question

A data set consists of the following data points:

(2, 4), (4, 7), (5, 12)

The slope of the best-fit line is 2.5. Find the y-intercept of this line.

A. -1
B. -2.5
C. -1.5
D. -2

Answer 1

let's use the first ordered pair
\(4=2.5*2+b\)
b is the y-intercept
\(2.5*2=5\)
\(4=5+b\)
subtract 4-5
\(-1=b\)