Question

The slopes of perpendicular lines are _____ _____ of each other, which means their product is -1.


A. positive reciprocals
B. negative reciprocals
C. fractional reciprocals

Answer 1

Negative reciprocals

Answer 2

Ex:
slope = 2
perpendicular slope = \(-\dfrac{1}{2}\)

Answer 3

There is one exception to this: a vertical line and a horizontal line are perpendicular, but the product of the slopes will not equal \(-1\) because the vertical line has an undefined slope and the horizontal line has a slope of \(0\).