Given the vectors 3x - 6y - 2z = 15 and 2x + y - 2z = 5, (a) Find a vector parallel to the line of intersection of the planes. (b) Find the equation of the plane given the points (3, -1, 0) using part (a). (c) Find the parametric equations using the given points from part (a) and (b). (d) Find the angle between the given planes.