SOLUTION: Explain the "Vertical Rule" why it works in finding out if a graph or a rule is a function.

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Question 732112: Explain the "Vertical Rule" why it works in finding out if a graph or a rule is a function.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
A vertical line will intersect a function in no more than one point. Each x value has no more than one y value.