Solve the following system of equations using matrices: x + 2y - z = -3 2x - 4y + z = -7 -2x + 2y - 3z = 4

{(-4, 1/2, 0)}

{(-3, 1/2, 1)}

{(-2, 1/2, -1)}

{(3, 1/2, 2)}