Which relation is a function, and why
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Which relation is a function, and why

[From: ] [author: ] [Date: 11-09-04] [Hit: ]
-1), (4,7), (2,b. {(5,......
a. {(5,-3), (2,8), (-5,-1), (4,7), (2,1)}
b. {(5,3), (2,8), (-5,-1), (4,7), (5,7)}
c. {(-5,3), (2,8), (-5,-1), (4,7), (2,2)}
d. {(5,3), (2,8), (-5,-1), (4,7), (-2,1)}

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A function can only have one x-value for each y-value. D is the only choice that satisfies this condition.
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