A mapping diagram is a graphic tool that helps to visualize a relation. In a mapping diagram, the inputs are listed in one set and the outputs in another. Then, arrows are drawn from each input to its corresponding outputs.
This mapping diagram shows the relation defined by the set {(-2,-8),(-1,11),(0,5),(2,-8)}. Note that -8 is the output of two different inputs, -2 and 2.
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