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For the graphs in HELM Book 2 Figure 30, identify which are one-to-one, and which are many-to-one.

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Which of the six function shown are one-to-one and which are many-to-one?

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A one-to-one function has only a single input ($x$) value mapping to each output ($y$) value.

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A many-to-one function has multiple input values mapping to the same output value.

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