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Your request doesn't make much sense. If you only have one X-Y pair to meet, then a constant fits the specs perfectly:
    f(x) = K
If it has to meet two X-Y pairs, then a line does it:
f(x) = K1x + K2
A quadratic can hit three points:
f(x) = K1x2 + K2x + K3
This is also known as a "second order" polynomial. Each additional order allows the function to hit one more point exactly (within some limits, like they all have to have different X values).

If you only have one X-Y pair to meet, then a constant fits the specs perfectly:
    f(x) = K
If it has to meet two X-Y pairs, then a line does it:
f(x) = K1x + K2
A quadratic can hit three points:
f(x) = K1x2 + K2x + K3
This is also known as a "second order" polynomial. Each additional order allows the function to hit one more point exactly (within some limits, like they all have to have different X values).