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The vertical line test explained: determining if a relation is a function.

Two graphs illustrating the vertical line test: left graph shows a line intersecting a straight line once, indicating a function; right graph shows a curve intersecting a vertical line twice, indicating not a function.

Two graphs illustrating the vertical line test: left graph shows a line intersecting a straight line once, indicating a function; right graph shows a curve intersecting a vertical line twice, indicating not a function.

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