a) Find a vector orthogonal to the plane passing through the points P(1,2,1), 0(2,1, - 3) and R(3,1,5). b) Find an equation of the plane in part (a). c) Find the parametric equations of the line through the point (1 ,3,-2) and parallel to the vector V = . d) Find the intersection point of the line in part (c) with the yz-plane