# How do you find the slope of a line perpendicular to y=-8?

Jun 13, 2018

$\text{perpendicular slope is undefined}$

#### Explanation:

$\text{the equation } y = - 8$

$\text{is a horizontal line parallel to the x-axis and passing}$
$\text{through all points in the plane with a y-coordinate of } - 8$

$\text{since it is parallel to the x-axis it's slope } = 0$

$\text{a line perpendicular to it would therefore be a vertical}$
$\text{line parallel to the y-axis}$

$\text{with undefined slope}$