3x y 7 11 2 July 8, 2019 16 32 64 128 3x y 7 11 2 10 X y 7 3x 2y 11 X y 7 3x 2y 11 by substitution method 2x y 7 3x 2y 11 X y 7 3x 2y 11 by elimination method X y 7 3x 2y 11 simultaneous equation 3x 2y 7 y =- 3x 11 X y 7 and 3x 2y 11 solve 2x y 7 dan 3x 2y 11 Solve x y 7 and 3x 2y 11 by substitution method