Posted by **drew** on Monday, February 4, 2013 at 12:27pm.

Which of the following relations is a function?

A. {(5, 2), (3, 2), (4, 2), (5, 1)}

B. {(1, 2), (1, 3), (2, 1), (3, 4)}

C. {(1, 3), (2, 6), (3, 8), (1, 7)}

D. {(1, 4), (8, 9), (10, 11), (12, 12)}

I say c

- algebra -
**Reiny**, Monday, February 4, 2013 at 1:28pm
If for every x, there is one and only one value of y, we have a function

in your c)

I see 1 --->3

and 1 ----> 7

oops, contradiction!

same is true for a and b

mmmmhhh, look carefully at D

- algebra -
**bobpursley**, Monday, February 4, 2013 at 1:29pm
in b, x=1, y=2 or 3 not a function

in c, x=1, y=3 or 7, not a function

In a, x=5, y can be two values. not a function

in d. each x has a related unique y.

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