X y 1 2x 3y 7 July 8, 2019 16 32 64 128 X 3y 7 2x y =- 1 by graphical method K 1 x k 1 y 3k 1 2x 3y 7 X 3y 7 2x y =- 1 by simultaneous equations X 3y 7 2x y 1 0 X 3y 1 4x 3y 2x y 7 2x y x 3y =- 1 7 7x 36y 47 3