**You need to know the equation above to be able to tell if a graph will be an ellipse, a circle, a hyperbola, or a parabola..
*If A does not equal C and the signs are the same, then the graph is an ellipse.
*If A and C are equal, then the equation is a circle.
*If A and C are different signs then the graph is a hyperbola.
*If A and C equal 0, then the graph is a parabola.
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