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Which set of ordered pairs is not a function?

A. (3, 1), (–1,1), (1, 1), (3, −1)
B. (–3, 1), (–1, 1), (1, 1), (3, 1)
C. (–3, 1), (–1, –1), (1, 1), (3, 1)
D. (–3, 1), (–1, –1), (1, 1), (3, −1)

Respuesta :

The answer to this is A. (3, 1), (–1,1), (1, 1), (3, −1).Remember that no two x's can be the same in a function. 

A The answer to this is A. (3, 1), (–1,1), (1, 1), (3, --1)