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Explain what the vertical line test is and how it is used

User Jens Wegar
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Answer:

You take a pencil and slowly go across the graph from left to right. If any two points are under the pencil at any one time, the relations is not a function. For a relations to be a function, every input must have only one output, so there will be no two points graphed vertically on top of each other.

Explanation:

User Koninos
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