My problem

At temperature 5 degrees the Y=1.00228594 for X=435 and Y=1.000986038 for X=449 and Y=0.999760292 for X=463

At temperature 7 degrees the Y=1.002094781 for X=435 and Y=1.00079709 for X=449 and Y=0.999573015 for X =463

For a new temperature of 9.6 degrees and at 16 degrees how to find the Y values for different X values

What I did

I find a polynomial eqn for the first set of X and Y values , then I find a polynomial eqn for the second set of X and Y values in excel. How can i find a polynomial for a different temp in excel

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