5x 7 3x 12 July 8, 2019 16 32 64 128 4 5x 7 )- 3x 12x 27 Y 5x 7 3x 2y =- 12 2 3x 7 )- 5x 3x 12 12 5x 1 7 3x 2x 5x 7 3x 5 2x 12 Y 5x 7 3x 2y =- 12 solve by substitution Y 5x 7 3x 2y =- 12 answer 4 5x 2 3x 7 12 0 5x 2 3x 7 12 X 7 3x 5x 12 1 5 7 3x )= 12x 5x 5x 2 3x 7 and 12x 12 5x 12x 7 )- 3x 20x 5
