For the first equation go down 2 on the y- axis. Then, go up 5 and over to the right 1. Then shade above the line.
For the 2nd equation get y by itself and you the steps I just gave you, but using the numbers in this equation.
V = a^3
729 = a^3
9^3 = a^3
9 = a
answer. side length = 9 in