5x-6y=-15 5x+6y=12 use elimination
5x-6y=-15 5x+6y=12---------------add10x = -3x = -3/10x = -0.35x+6y=125(-0.3) + 6y = 126y = 12 + 1.56y = 13.5y = 13.5 / 6y = 2.25