# How do you find the slope of a line perpendicular to the line y= -1?

Jul 22, 2016

The line represented by the equation $y = - 1$ is a horizontal line with a slope of $m = 0$. The line perpendicular to this would be an vertical line $x =$ and have a slope of $m =$ undefined .

#### Explanation:

The line represented by the equation $y = - 1$ is a horizontal line with a slope of $m = 0$.

This line has a no rise or $\Delta y = 0$

The line perpendicular to this would be an vertical line $x =$ and have a slope of $m =$ undefined .

This line has a no rise or $\Delta x = 0$