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Last Updated Sep 27, 2025

Vertical Line Test Simplified Revision Notes

Revision notes with simplified explanations to understand Vertical Line Test quickly and effectively.

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Vertical Line Test

The vertical line test is used to determine whether a graph represent a function.

The following graph represents y=x2y=x^2.


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The graph passes the vertical line test. That is, each vertical line passes the graph at most once.

If any vertical line intersects the graph more than once, the graph does not represent a function.


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The equation of a circle is not a function.

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