15 - t + 8t = -13 4a + 11 - a = 2
15-t + 8t = -1315 + 7t = -137t = -13-157t = -28t = -44a + 11-a = 23a = 2-113a = -9a = -3
remember you can do anything to an equation as long as you do it to both sides15-1t+8t=-1315+7t=-13minus 15 both sides7t=-28divide both sides by 7t=-44a+11-1a=23a+11=2minus 11 both sides3a=-9divide by 3 both sidesa=-3
