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put this solution on YOUR website!a function is limited to a relationship that has one y for each x
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This can be checked with the vertical line test,,where a vertical line is passed thru the figure, and for every x position, there should be only one y value.
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If we look at the shape of an ellipse, we will always have two values of y for every one value of x,
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Therefore an ellipse is NOT a function
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