Answer:
23. y = 2x - 3
Step-by-step 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
