# Vertical Line Test

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This Demonstration shows the vertical line test applied to the graphs of four different types of equations. As you use the horizontal slider to control the vertical line, red points appear anywhere that the line crosses the graph of the equation. If there is more than one crossing, then the graph does not pass the vertical line test, and therefore the equation does not define as a function of .

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Contributed by: Laura R. Lynch (February 2013)

Open content licensed under CC BY-NC-SA

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