ax + z = aw - y ax - aw + z = -y Subtract aw from both sides. ax - aw = -y - z Subtract z from both sides. a(x - w) = -y - z Factor ax - aw. a = (-z - y)/(x - w) Divide x - w froem both sides. a = (-1(y + z))/(x - w) Change the solution. a = -(y + z)/(x - w)
