### Home > CALC > Chapter 2 > Lesson 2.3.3 > Problem 2-129

2-129.

What is the relationship between the slopes of perpendicular lines? If you know the slope of one of the lines, how can you find the slope of a line perpendicular to it? Homework Help ✎

Choose a number to represent the slope of line *A*.

Divide −1 by your number.

Simplify.

That is the slope of line *B*.

How do the slopes compare?

The slopes of perpendicular lines are negative reciprocals.