what is a way to solve 3x-8y=-72 and 5x+8y=8

Question

It is a graphing equation ... i think i may have to change it from a+b=c to the formula y=mx+b and im unaware of how to do that so can you help me with changing it?

Answer 1

3x-8y=-72

5x+8y=8

On adding both the equations you get 8x=-64 or x=-8

Hence y=6

Answer 2

1. -8y=-3x-72

y=3/8x+9