Question

I only need help with #23

Answer 1

23. y = 2x - 3

Explanation:

Slope m = (y2-y1)/(x2-x1)

Using coordiates (2,1) and and (1, -1)

m = (-1 - 1)/(1 - 2) = (-2)/(-1) = 2

then y = mx + b

Using coordinates (1, -1) then

-1 = 2(1) + b

-1 = 2 + b

b = - 3

so y = 2x - 3