write (-1,1) and (2,-3) in slope intercept form

Answer 1

y = mx + b

m = (-3 - 1)/(2 + 1) = -4/3

y = (-4/3)x + b

Find b from either given point.

1 = (-4/3)(-1) + b

b = -1/3

y = (-4/3)x - 1/3