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The relation {(-1, 4), (2, 7), (3, 7)} is a function.
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The relation {(-1, 4), (2, 7), (3, 7)} is a function.

User Khadeeja
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It is a function because the X does not repeat. If the X repeat then it is not function for example.
(2,4), (5,6), (2,8) if it repeat like this then it is not function
User Ghazanfar
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