3x y 1 2x 3y 8 July 8, 2019 16 32 64 128 3x y =- 1 2x 3y =- 8 by substitution method 3x y 1 0 2x 3y 8 0 by substitution method 3x y 1 0 2x 3y 8 0 3x y 1 0 2x 3y 8 0 by elimination method 3x y 1 3 2x 3y 8 3