2x 9 5x 2 July 8, 2019 16 32 64 128 2x 9 5x 27 2x 9 5x 21 2x 9 )( 4x 2 5x 12 4x 2x 9 2 5x 6 2x 2 5x 9 0 2x 2 5x 9 factor 2x 3 5x 2 9 2x 3 5x 2 6x 9 0 2x 3y 4 5x 2y =- 9 2x 5x 9 26 2x 9y 9 5x 2y 27 substitution method 2x y 9 5x 2y 27 2x 9 5x 4x 6x 2 2x 2 4x 9 5x 2 2x 9 x 2 5x 6