- #1

Somefantastik

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[tex]\frac{{\left( {x - x_0 } \right)^2 }}{{a^2 }} + \frac{{\left( {y - y_0 } \right)^2 }}{{b^2 }} = 1 [/tex]

How do I add a constraint on that to make sure that it lies above the plane z = -1? I'm confused about it b/c its equation does not involve z (a degenerate quadric?)