Determine whether the planes are parallel.
(a) (- 1, 2, 4) - (x - 5, y + 3, z - 7) = 0; (2, - 4, - 8) - (x + 3, y + 5, z - 9) = 0
(b) (3, 0, - 1) - (x + 1, y - 2, z - 3) = 0; (- 1, 0, 3) - (x + 1, y - z, z - 3) = 0