A/b = c for b me this alot of a points

A, b, c, and d have the coordinates (-8, 1), (-2, 4), (-3, -1), and (-6, 5), respectively. which sentence about the points is true? a. a, b, c, and d lie on the same line. b. and are perpendicular lines. c. and are parallel lines. d. and are intersecting lines but are not perpendicular. e. and are parallel lines.

Can anyone explain to me how to do this? anything will .

Sole the equation 6n + 9 = -3n - 21 - 6 for n