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writing a rule

how do i write a rule for the following functions
x          -1        0           1               2
y           3         1          1/3          1/9
I think x you are adding by one   and y you are dividing by 3.
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1 Answer

It depends on whether you're trying to find a relationship between x and y, or for each function, x, and y, separately.  y = (1/3)x is correct for the former.  
For the latter, you would have  iterative functions, where the next term (i) in the series depends on the previous one (i-1) in the following manner:
x= xi-1 + 1  and yi = yi-1/3