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Determining if a Relation is a Function

Determining if a Relation is a Function 1.5 - Solution

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For a relation to be a function, each -value can only be paired with one -value, but one -value can be paired with multiple -values. In a mapping, the -values in the input can only point to one -value in the output.

In the given mapping diagram, we can see that one of the -values corresponds to multiple -values.

Since not all of the values in the input only point to one value in the output, the relation is not a function.