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The Vertical Line Test

The Vertical Line Test. The vertical line test is used to determine if a graph is a function. Created by: David W. Cummins. If a vertical line passes through a graph more than once, the graph is not the graph of a function. Hint:

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The Vertical Line Test

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  1. The Vertical Line Test The vertical line test is used to determine if a graph is a function. Created by: David W. Cummins

  2. If a vertical line passes through a graph more than once, the graph is not the graph of a function. Hint: Pass a pencil across the graph held vertically to represent a vertical line. The pencil crosses the graph more than once. This is not a function because there are two y-values for the same x-value.

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