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Algebra II, ellipse/hyperbola graping question, how to get started graphing it?

The question is sketch the graph of the equation :

x^2


4

-y^2


9

=

1

To begin sketching this graph, I thought that you were supposed to rewrite the top parts of the problem such as (x+0)^2 - (y+0)^2

so you would get (0,0) for the center of the graph?

and my other question is:

since 4 = 2^2 , and 9 = 3^2 , would the center be 3,2 ? or would that be how many units you move from (0,0) ?

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