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Determine which relation is a function.

Determine which relation is a function.-example-1
Determine which relation is a function.-example-1
Determine which relation is a function.-example-2
Determine which relation is a function.-example-3
Determine which relation is a function.-example-4

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The answer is the fourth graph.

So what makes a function a function is that every input (x) has only one output (y). To test if a line is a function on a graph, you would use something called the "vertical line test". Move a vertical line across the graph, and if at any point there was more than one point on the vertical line it would not be considered a function. And the only graph that has no more than one point when moving a vertical line across the graph is the last graph.

User Joseph Earl
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