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How to know if something is a relation or not

User Ntjess
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Everything that is given in ordered pairs is a relation. But not all relation is a fuction. In this case it is, because there is no repeated information. For example. If in 1 week he reads 20 books and in the same week he reads 30 books, there is information repeated, so that would not be a function. If you wanted to see it like ordered pairs, you can not have somethin like this in a fuction


(1,5),(1,8)

Because you will have a domain point with two different images.

User Soz
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