Mapping diagram of y = x², a function that isn’t one-to-one

An example figure from the Mapping Diagram Generator.

A mapping diagram titled y = x² with inputs −2, −1, 1 and 2 and outputs 1 and 4, two arrows ending at each output — A mapping diagram titled y = x², with the inputs −2, −1, 1 and 2 on the left, titled x, and the outputs 1 and 4 on the right, titled y. −2 and 2 both have arrows to 4, and −1 and 1 both have arrows to 1.

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Answer key

A function: every input goes to exactly one output.
Ordered pairs: (−2, 4), (−1, 1), (1, 1), (2, 4)

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