What is the equation of the line of best fit that Mel drew?

Write the equation of the circle centered at (10,-2) with radius 2

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.

Ineed ! i can’t figure out this graph