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Circles and Ellipses: Which equation models the graph?

Please view the attachment below to match up the correct equation with the graph.

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The answer is the first one, x^2/16+y^2/4=1
The way to see this is the following.
The graph is an ellipse centered at (0,0).
So the equation is ...

Solution Summary

The equation of a circle or ellipse is found by looking at a graph.

$2.19