# How do you find the slope that is perpendicular to the line y=x?

Aug 4, 2016

$- 1$

#### Explanation:

$y = m x + c$
where m is the slope of the line
Slope $m 1$ of the line perpendicular to the above line will be
$m 1 = - \frac{1}{m}$

So Slope $m 1$ of the line perpendicular to the line $y = x$ will be
$- 1$