Yo solve these for me pwease
1. 6 + 7x = 13
2. y + (-16) = 30
3. -x/6 + 5 = 3

Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z) = xyi + 5zj + 7yk, c is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 81.