You plug in the y= equation into the y in the other equation and solve, once you get x you plug that in and solve for y
for example: y=4x and 30=2y+2x so: 30=2(4x)+2x 30=8x+2x 30=10x 3=x then, you plug 3 (x) in for x in either of the starting equations: 30=2y+2(3) 30=2y+6 24=2y 12=y and get your answer: (3,12)
