If (A x^{2}+C y^{2}+D x+E y+F=0), for Problems 9-13, then list conditions on the constants to assure

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If \(A x^{2}+C y^{2}+D x+E y+F=0\), for Problems 9-13, then list conditions on the constants to assure that the indicated graph results.

a circle \(A=C eq 0\)

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