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If the graph passes the vertical line test (one y for every x):
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Concept:
s is a function.
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Example:
the point (2,5) lies on s, so s(2) = 5. If the graph does not pass the vertical line test (one x with multiple y’s):
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Concept:
s is not a function.
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Example:
the graph contains both (2,3) and (2,7).