4 3y 1 )- 3 2y )= 6 July 8, 2019 16 32 64 128 3 2y 1 )- 4 1 3y )- 5 6y 7 )= 16 1 3 6x 2y 2 2x 3y 4 3y 1 4 2y 3 3 1 7y 6