(a) Find parametric equations for the line through (4, 4, 8) that is perpendicular to the plane x - y + 4z = 1. (Use the parameter t.) ( x (t ) , y (t ) , z(t ) ) = (b) In what points does this line intersect the coordinate planes? xy-plane (x, y, z) = yz-plane (x, y, z) = xz-plane (x, y, z) =