Question

How do you find the equation of a line with slope of -3 and contains the point (0, -3)?

Answer 1

`y=-3x-3`

Explanation:

Formula for a line: `y=ax+b`
`a` represents slope which is `-3`
`y=-3x+b`
Then we know this line must go through the point (0,-3).
So x=0 and y=-3. Let's substitute and find the value of `b`

`-3=-3*0+b`
`-3=b`
and finally we have everything we need: `y=-3x-3`