1 2x 3y 5 0 July 8, 2019 16 32 64 128 3x 4y 1 0 2x 8 3y 5 0 2x 3y 5 0 10x 21y 1 0 If kx 3y 1 2x y 5 0 2x 3y 5 dy dx 2x 3y 1 0