Question

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

Answer 1

`-1`

Explanation:

`y=mx+c`
where m is the slope of the line
Slope `m1` of the line perpendicular to the above line will be
`m1=-1/m`

So Slope `m1` of the line perpendicular to the line `y=x` will be
`-1`