SOLUTION: is the following relations a function ? explain you answer (1,2) (2,3) (2,5) (2,7)

Question 484494: is the following relations a function ? explain you answer (1,2) (2,3) (2,5) (2,7)
Answer by tinbar(133) (Show Source): You can put this solution on YOUR website!
A function requires that every input have only one output. In other words, if we have pairs that represent (input, output), if there exists a certain value for input in some pair, it should not occur again, unless of course it describes the same output.
The input value 2 causes a problem. It has outputs 3, 5, and 7. Since there is more than one output for some input, in this case 2, this relation does NOT satisfy the requirement to be a function as well.
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