X 2y 9 2 July 8, 2019 16 32 64 128 X 2y 9 2x y 3 X 2y 9 2x y 8 X 2y 9 2x 4y 20 X 2y 9 2x 4y 18 X 2y 9 2x 4y 7 X 2y 9 2x 3y 4 X 2y =- 9 y 3x 2 X 2y 9 3x 2y =- 5 9 x 2y )-( 2x 5y Y 2x x 2y 9 9 2 x 2y )-( 2x 5 8y 2x 3y 10 x 2y =- 9 3x 2y 11 x 2y 9 X 2y 2z 9 X 2y 2 9 0 is a linear equation