If f and y are inverse functions and f(2)=9, what is y(10)?
f(x) is the inverse of y(x)
y(f(x))=1 and f(y(x))=1
f(2)=9, then y(9)=2
y(10)=y(9+1)=y(9)+y(1) = 2 + y(1)
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