problem 7:

In Exercises 5 - 8, a surface S in space is described that can- not be defined in terms of a function z = f(x, y). Give a parametrization of S. 5. S is the rectangle in space with corners at (0, 0, 0), (0, 2, 0), (0, 2, 1) and (0, 0, 1). 6. S is the triangle in space with corners at (1, 0, 0), (1, 0, 1) and (0, 0, 1). 7. S is the ellipsoid 4 + 16 =1. 8. S is the elliptic cone y = x2 + 22 16 for - 1