Question

How do you write the equation for the line that passes through point (4, -5) with a slope of 4?

Answer 1

`y=4x-21`

Explanation:

`y=kx+n`, `k` is slope `=>k=4`

`A(4,-5) => x=4, y=-5`

Inserting data into `y=kx+n` gives us:

`-5=4*4+n <=> n=-5-16 <=> n=-21`

And hence:

`y=4x-21`