Solve for x in 5x - 3y = 18
x = 3(6 + y)/5
Substitute x = 3(6 + y)/5 into 3x + 3y = 30
9(6 + y)/5 + 3y = 30
Solve for y in 9(6 + y)/5 + 3y = 30
y = 4
Substitute y = 4 into x = 3(6 + y)/5
x = 6
Therefore,
