SOLUTION: how can you tell when a graph is a function or not a function?

SOLUTION: how can you tell when a graph is a function or not a function?

Algebra.Com

Question 160675: how can you tell when a graph is a function or not a function?

Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
Imagine "vertical lines" drawn anywhere along the graph AND it ONLY crosses the graph ONE time it is a function. Otherwise, if it crosses the graph MORE than one time, it is NOT a function.
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