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Only the last picture represents a function. In fact, a function can associate only one output for every given input.

Graphically, this means that every vertical line must cross the graph only once.

The first graph is literally a vertical line, so it can't be a function.

The second graph can't also be a function, because every vertical line drawn for will cross the graph in two points.

The last graph is a function, because every vertical line will cross it only once.

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step-by-step explanation:

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step-by-step explanatio89