Which relation is not a function? A. (2, 9), (−1, −5), (1, 5), (5, 0), (12, 3) B. (−3, 1), (6, 2), (8, 3), (6, 4), (3, 5) C. (5, 1), (4, 2), (3, 3), (2, 4), (1, 5) D. (7, 2), (5, 3), (3, 4), (1, 5), (−1, 6)

B is a relation that's not a function.

So the answer is ( B )

Because there's a repetitive domain and that's x = 6. There're (6,2) and (6,4). Function can only have a domain that gives one output.

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