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)}

Each X value has their own Y value, at least it appears that way- how do I determine? Thank you so much

Question

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)}

Each X value has their own Y value, at least it appears that way- how do I determine? Thank you so much

sweetburger · Answer

http://www.regentsprep.org/Regents/math/algtrig/ATP5/Lfunction.htm

sweetburger · Answer

each x value must have only 1 y value

dumbsearch2 · Answer

AHH!!! :D
Thank you lifesaver.
Now I know the definition.

jdoe0001 · Answer

the one that doesn't have an X-REPEAT

dumbsearch2 · Answer

Now everything's clear. Thanks.