SOLUTION: how do I tell wether a graph represents y as a funtion of x?

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Question 118498: how do I tell wether a graph represents y as a funtion of x?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Draw vertical lines thru the graph.
If each vertical line intersects the graph only once
you have a fundtion because you are showing that for
each x value has only one corresponding y value.
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Cheers,
Stan H.