Question 1135672: Which of the following relations is a function?
A.
(1, 1), (-1, 4), (-4, 1), (1, -5)
B.
(-4, 1), (-1, 4), (1, -5), (-1, 6)
C.
(-4, 1), (-1, -5), (1, 5), (7, 1)
D.
(-4, 4), (-1, 6), (-4, 3), (7, 2)
Answer by greenestamps(13200)   (Show Source):
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Find the answer yourself; you won't learn anything by having us give you the answer.
A relation defined by a set of ordered (x,y) pairs is a function if there are not two different y values for the same x value.
I'll get you started: Answer A is NOT a function, because the two pairs (1,1) and (1,-5) have two different y values for the same x value.
Two of the other three answer choices have the same thing that makes them NOT functions. There is only one where that kind of thing does not occur; that one is the function.
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