Hello! Please help me out with this calculus 3 problem. I just want to see a step by step on how to solve it ON PAPER. No need to explain each step in words. Solve them problem so I can understand. Thanks!

(6) Let C be the closed curve starting at (0, 0), going from there to (3, 9) along y = x2, then from (3, 9) along a straight line to (0, 9), and then along the y - axis from (0, 9) back to (0, 0). Use Green's theorem to find Saydx - xdy