2. Answer the following 3 questions and write down each step of your solution. (a) (4 points) Find an equation of the plane (P1) that passes through the points A(2, 1: 2), B(1,3:3) and C(1,1:3). (b) (4 points) Show that tho planes (P1) and the plane (P2) : 2:1: 3-3; + 4:: : 5 are neither parallel nor perpendicular. (c) (4 points) Find the parametric equations-1 for the line of intersection of the two planes (P1) and (I32)