X 2 2y 2 0 July 8, 2019 16 32 64 128 X 2 2y 2 0 graph X 2 3xy 2y 2 0 X 2 y 2 2y 0 X 2 2y 2 dx xydy 0 X 2 y 2 2y 0 graph X 2 2y 2 dx 2xydy 0 2x 2y x 2 2y 2 0 2xydx x 2 2y 2 dy 0 X 2 y 2 2x 2y 2 0 X 2 2y 2 2xy 2y 1 0 X 2y 2 y 5 2 0 X 2 y 2 2y 3 0 X 2 2y 2 1 0 X 2 2xy 2y 2 0 X 2 2y 2 5 0