2y 3 y 9 2 7 July 8, 2019 16 32 64 128 2y 2 7y 3 y 2 9 7 2y 1 )+ 3y =- 3 y 2 )+ 9 2 7 + 3y = 9(y - 2 1) 2 7+3y=9•(y-2 1)