Strong calculation in mathematical

Hello,
  
If we write = x^2  and if I give to the program the values of x, it will
going to calculate the values of y, and also for x.  

But it is possible ? that is if I give to the program the values of X and Y,
it will indicate to me the relation between the two variables, in the other
hand if I look to the program x=2 y=4, x=3 y=9 ect... it is going to show me
that f (t)!!!

Thanks 
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