3x + y = 7 + y = -(15/2) + y = 7 –(x/4) –x + y = 0 –(2/5)x + y = 10 –x 3x + y = 0 -6x + y = 4 (2/3)x + y = 5 3x + y = -2 -2x + y = -6 + y = -3 –(1/6)x
–x + y = 7 –(2/5)x + y = 0 3x + y = 0 (2/3)x + y = 5 -2x + y = -6 3x + y = 7 –(x/4) + y = -(15/2) –x + y = 10 -6x + y = 4 3x + y = -2 –(1/6)x + y = -3