Exercise 1 Find the parametric equation of the cone z = x + y, over the circular region x + y 4. Plot the surface Exercise 2 Find the implicit equation of the plane given by the parametric equation. r(u,v) = 4ui-vj+vk, 0u 2, 0 v1. Plot the surface. Exercise 3 Find the explicit equation of the paraboloid given by the parametric equation r(u,v) = 2u cosvi+2u sinvj+uk,. 0u2, 0v 2 Exercise 4 Plot the surface S given by z = 2, x + y 1. Find a parametric equation for the surface S. Exercise 5 Find a parametric equation of the surface S: 2x+3y+6z=12, first octant. Plot the surface S.