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For each relation, decide whether or not it is a function.

For each relation, decide whether or not it is a function.-example-1

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Relation 1 IS a function.
Each input is used only once, so each input is paired with exactly one output.

Relation 2 is NOT a function.

The input of 3 has two different outputs.

Relation 3 IS a function.
Each x-value is used only once, so each input is paired with exactly one output.

Relation 4 IS a function.
Each x-value is used only once, so each input is paired with exactly one output.

It's all about looking at the x-values/inputs. If there's ever a repeated x-value/input, it's not a function. If they x-values/inputs are all different, then it is a function.

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