Question

Using the graph below, calculate the equation for the line of best fit.

Answer 1

Use:
M=(y-y1)/(x-x1) to find the slope

Answer 2

y=18
y1=30
x=20
x1=70

Answer 3

M = (18-30)/(20-70)=-12/-50=6/25

Answer 4

y-18=(6/25)(x-20)

Answer 5

or
y = (6/25)(x-20)+18