4. (a) Determine if the four points P (1,1,–2), P2(4,0, -3), P{(1, -5,10), and P (-7,2, 4) lie on the same plane. (b)Two vectors are parallel if and only if they are nonzero scalar multiple of each other's. Find a vector b that is parallel to a = 3i + 7j and has magnitude 2.