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Which relation is a function?

label Algebra
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I.   {(2, 4), (-1, 7), (3, 0), (5, 4)}
II.   {(-3, 6), (-3, 6), (8, 6), (8, 10)}
III.   {(4, 1), (-2, 5), (-8, 3), (4, 6)}

A: I only

B: I and II

C: II and III

D: II only


Apr 6th, 2015

A is the right answer. 

Relation II is not a function because of the pairs (8,6) and (8,10).

Relation III is not a function because of the pairs (4,1) and (4,6).

Apr 6th, 2015

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Apr 6th, 2015
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Apr 6th, 2015
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