1 3 5 9 y 7 2 July 8, 2019 16 32 64 128 1 3 y 5 9y 7 2 1 2 3 4 5 6 y 7 8 9 9 1/5 - y = 7 3/5 1 3 9 27 pattern rule 9 3y-5 7y=16 2
