Which equation represents the line that passes through the points (7, 8) and (3, -4)

First I will find the slope using the slope formula;

-4 - 8 / 3 - 7

-12/-4

3

So 3 is the slope now we just subtract 13 to get the points, so the equation is 

y = 3x - 13

If correct brainliest please

Thank you

:)

He was paid 23 dollars for each lawn