Determine which relation is a function.

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

B.
{(–4, 1), (–2, 3), (–2, 1), (–1, 5), (3, 2)}

C.
{(–4, 1), (–2, 3), (–1, 2), (3, 5), (3, 2)}

D.
{(–4, 1), (–2, 3), (–1, 1), (–1, 5), (3, 2)}

Question

Determine which relation is a function.	
 
 A.
{(–4, 3), (–2, 3), (–1, 2), (2, 5), (3, 2)}
 
 B.
{(–4, 1), (–2, 3), (–2, 1), (–1, 5), (3, 2)}
 
 C.
{(–4, 1), (–2, 3), (–1, 2), (3, 5), (3, 2)}
 
 D.
{(–4, 1), (–2, 3), (–1, 1), (–1, 5), (3, 2)}

anonymous · Answer

What is the definition of a function?

anonymous · Answer

idk im just now learning this stuff

anonymous · Answer

Do you have notes that you have taken, or a book that you can reference?

anonymous · Answer

um nope

anonymous · Answer

That is interesting. I would think that the very first thing a teacher might provide is the definition as it is key to your understanding and success. 
Try googling the defenition

anonymous · Answer

Well, did you try finding the definition of a function?

anonymous · Answer

It would be A because non of the x variable are repeating. For example B is not a function because-2 has two different y variable and that is what makes not a function.