What are the inputs and outputs of the following relation? Is it a function?{ (-1,2), (2, 51), (1, 3), (8, 22), (9, 51) }

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1. What are the inputs and outputs of the following relation? Is it a function?
{ (-1,2), (2, 51), (1, 3), (8, 22), (9, 51) }