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Ten students at Roosevelt High School studied movie-going habits of different age groups. The following set of ordered pairs compares age (x) to the number of movies seen (y) at a local theater in a given month.
{(15, 1), (16, 2), (18, 4), (15, 0), (17, 3),
(16, 1), (17, 1), (18, 3), (17, 2), (16, 3)}
Which subset of the ordered pairs represents a function?
A. {(15, 1), (16, 3), (17, 2), (15, 0)}
B. {(15, 1), (17, 2), (18, 4), (16, 1)}
C. {(16, 1), ((16, 2), (17, 1), (17, 2)}
D. {(15, 0), (15, 1), (16, 2), (16, 3), (18, 4)}
What is B