kchart1234 kchart1234 13-06-2016 Mathematics contestada How can x + 8 = -x + 7 be set up as a system of equations? y = x + 8 y = -x + 7 y = x + 8 y = -3x + 7 y = x + 5 y = -2x + 11 y = 8 y = -3x + 7