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Determining if a Relation is a Function

Determining if a Relation is a Function 1.10 - 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 graph, we can check if each -value has only one -value by subjecting it to the vertical line test.

In the graph, each vertical line passes through the graph at only one point. Therefore, each -value corresponds to one -value and the graph is a function.