'roblem 6. (11.8f42) The plane 4x 3y + 8.7 = 5 intersects the cone -2 = x2 + y2 in an ellipse. a) Graph the cone, the plane, and the ellipse. b) Use the Method of Lagrange Multipliers to nd the highest and lowest points on the ellipse, i.e. those points where the z-coordinate is greatest and least