(1,1) (-1,-3) in slope intercept form

Question

what is the points (1,1) and (-1,-3) slope intercept form 

Answer 1

(y - y₁)/(x - x₁₎ = (y₂ - y₁)/(x₂ - x₁)

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

(y - 1)/(x - 1) = -4/-2 = 2

Cross multiply

 

2y - 2 = x - 1

2y = x + 1

y = (1/2)x + 1/2