# C = {(9, 1) (8, -3) (7, 5) (-5, 3)} is it a function?

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As an alternative to the other answer (probably below this one)

Yes

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It is not unusual to specify a finite/discrete function as a set of paired values where each pair represents a mapping of a Domain value to a Range value.

The limitation required for such a mapping to be a **function** is that any Domain value may only occur once within the defining set.

Note that the Domain values: **function**.

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Describe your changes (optional) 200

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No.

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This is just a set of coordinates. A function is a mapping that takes an element from a domain and maps it to one element in a range.

The set of coordinates may well come from a function, but they are not the function itself.

Describe your changes (optional) 200