Find equations of the line of intersection of the planes x + 2y + 3z = 3 and 3x + 2y + z = 1. (b) (5 points) Find the equations of two parallel planes, one containing the line 1₁(t)= (1+t,2-1,3+3t) and one containing the line 1₂(t) = (3-1,4+2t,-1-2t).