Mapping diagram of a function

An example figure from the Mapping Diagram Generator.

A mapping diagram with inputs 1, 2, 3 and 4 in an oval on the left, outputs 3, 5, 7 and 9 on the right, and one arrow from each input — A mapping diagram with the inputs 1, 2, 3 and 4 in an oval under the title Input and the outputs 3, 5, 7 and 9 in an oval under Output. One arrow goes from each input to one output: 1 to 3, 2 to 5, 3 to 7 and 4 to 9.

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Answer key

A function: every input goes to exactly one output, and no two share one, so it’s one-to-one.
Ordered pairs: (1, 3), (2, 5), (3, 7), (4, 9)

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