Which relation is a function?

A.

{(1, 2), (1, 5), (1, –1), (1, 4)}

B.

{(7, 12), (1, –5), (3, –10), (2, –5)}

C.

{(–3, 4), (–2, 5), (0, 9), (0, 12)}

D.

{(8, –1), (2, –1), (3, 8), (2, 5}

@Squirrels

Question

Which relation is a function?  
 
 

 
 

  

  A. 
 
{(1, 2), (1, 5), (1, –1), (1, 4)}
  
   

 
 

  

  B. 
 
{(7, 12), (1, –5), (3, –10), (2, –5)}
  
   

 
 

  

  C. 
 
{(–3, 4), (–2, 5), (0, 9), (0, 12)}
  
   

 
 

  

  D. 
 
{(8, –1), (2, –1), (3, 8), (2, 5}
 
@Squirrels

anonymous · Answer

A function means that the x values don't repeat. For instance {(-6,2),(7,8),(-6,4)} isn't a function since -6 is an x value and it repeats!

anonymous · Answer

@imbehindascreen so the answer is...?