Question

When lines are perpendicular their slopes flip and?

Answer 1

Answer:

Their sign changes.

Answer 2

For this case we have to:

Given two lines:

$y_ {1} = m_ {1} x_ {1} + b_ {1}\\y_ {2} = m_ {2} x_ {2} + b_ {2}$

By definition, if both lines are perpendicular to each other, then the product of their slopes is -1. That is to say:

$m_ {1} * m_ {2} = - 1$

ANswer:

The product of the slopes of two perpendicular lines is -1.