Write in slope-intercept form an equation of the line that passes through the points (−1,2) and (1,−6).

Answer 1

y = mx + b

m = (-6 - 2)/[1 - (-1)] = -8/2 = -4

y = -4x + b

Find b from either given point.

2 = -4(-1) + b

b = -2

y = -4x - 2