Which relation is a function?

A.

(0, –45), (–45, –13), (18, –45)

B.

(33, –11), (23, 18), (23, –9)

C.
(8, 48), (8, 55), (9, 60)

D.

(–13, 30), (30, 19), (–13, 39)

Question

Which relation is a function?  
 
 

 
 

  

  A. 
 
(0, –45), (–45, –13), (18, –45)
   
   

 
 

  

  B. 
 
(33, –11), (23, 18), (23, –9)
   
   

 
 

  

  C. 
  (8, 48), (8, 55), (9, 60)   
   

 
 

  

  D. 
 
(–13, 30), (30, 19), (–13, 39)

anonymous · Answer

@Hero

anonymous · Answer

A is a function since it has no two points that have the same x value. The rest aren't functions since they have two points with the same x value