Question

What is the equation of the line with slope `m= -1` that passes through `(-1,1)`?

Answer 1

`y = -x`

Explanation:

Using

`y -b = m(x-a)" "`, where

`m=-1" "` and `" "(a,b) = (-1,1)`

Then

`y-1 = -1 (x + 1)`

So

`y-1 = -x -1`

Hence `y = -x` is the equation of the line

graph{-x [-10, 10, -5, 5]}