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The equation of an ellipse is

((x-x0)^2)/b^2)+((y-y0)^2/a^2)=1

hope that helps! : )

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that equation is for an ellipse, true, but that's not what is needed here.

In this case you can just use Kepler's 3rd law which is: p^2=a^3

Which means the period (in years) squared is equal to the radius (or semi major axis) in AU cubed.

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