WeBWorK using host: https://webwork-ptx.aimath.org, format: simple seed: 400

Describe the graph of each equation without graphing.

$x^2=9y^2-9$
at the point ; vertices: ; asymptotes $y=\pm$

$x^2-y=2x+4$
at the point , opening

$x^2+9y^2+4x-18y+9=0$
at the point with horizontal ; $a=$ , and $b=$

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