2 x 1 2 81 July 8, 2019 16 32 64 128 3 x 2 5x 2 1 81 X 2 25 y 2 81 1 Graph the circle x 1 2 y 2 81 X 1 2 81 0 X 1 2 y 2 81 2 1 9 x 2 81 X 6 2 y 1 2 81 general form X 6 2 y 1 2 81 1 x 1 2 x 2