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2 answers:
Hello!
I believe the answer to your question is A.
A is a function because it has only 1 -7 and the rest of the numbers correspond with -7.
I hope it helps!
It's A because the relation is a function, and it does represent the numbers (-3,-7), (-2,-7), (4,-7), (5,-7).
I hope this helps. =^)
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