39. Find symmetric equations for the line that lies in the plane y= 1 and is tangent to the intersection of the plane and the paraboloid z = x² + 16y² at (-3, 1, 25). 40. Find symmetric equations for the line that lies in the plane x = 2 and is tangent to the intersection of the plane and the cone z=√√x² + y² at (2, 2√3, 4).