Question

What is the slope of a line perpendicular to the line with equation y = 4x + 5?
A. –4
B. –5
C. 4
D. -1/4

Answer 1

Perpendicular lines have negative reciprocal slopes.
For example if a line had a slope of 3, it's perpendicular to that line has a slope of -1/3

Answer 2

So this would be D?

Answer 3

Yep.

Answer 4

Thank you!