The figure shows the surface created when the cylinder y2 + z2 = 7 intersects the cylinder x2 + z2 = 7. Find the area of this surface.

Solve the problem. Write parametric equations for the tangent line to the curve of intersection of the surfaces xy2-3z-5 and x-1 at the point (1. 1, 1).

4 6. Find the parametric equation of the line that is tangent to the curve of intersection of the surfaces r+2+2 and y = 1 at the point (1/2,1,1/2)