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Which relation is a function?

Which relation is a function?-example-1

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Answer:

The bottom right one (option D?)

Explanation:

Remember that a function never has the same x-value more than once. All of the other graphs have points that have the x-value with at least two different y-values, making them not a function. If you're confused, use the line test: draw a vertical line on each point. If one line covers more than one point, then the graph is not a function.

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