Decide whether the pair of lines is parallel, perpendicular, or neither.
-The line through (-12, 5)and (-4, 7)and the line through (5, 6)and (7, -2)
A)Neither
B)Perpendicular
C)Parallel

Question

Quizplus · Accepted Answer

The slope of the first line is (7-5)/(-4+12) = 2/8 = 1/4. The slope of the second line is (-2-6)/(7-5) = -8/2 = -4. Since the product of the slopes is -1 (1/4 * -4 = -1), the lines are perpendicular.

Decide Whether the Pair of Lines Is Parallel, Perpendicular, or Neither