SOLUTION: Exactly what is the vertical line test?

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Question 794750: Exactly what is the vertical line test?
Answer by tommyt3rd(5050) About Me  (Show Source):
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It is a way to check if a graphed relation is a function. If a vertical line can intersect a graph in more than one place that means that there is more than one vertical coordinate for at least one horizontal coordinate. This contradicts the definition of a function.