Which relation is a function?

A.

(–25, 16), (0, 16), (–25, 18)

B.
(19, 11), (34, 12), (34, 10)

C.
(35, 31), (24, 15), (12, 0)

D.
(34, 30), (18, 17), (34, 15)

Question

Which relation is a function?  
 
 

 
 

  

  A. 
 
(–25, 16), (0, 16), (–25, 18)
   
   

 
 

  

  B. 
  (19, 11), (34, 12), (34, 10)   
   

 
 

  

  C. 
  (35, 31), (24, 15), (12, 0)   
   

 
 

  

  D. 
  (34, 30), (18, 17), (34, 15)

rational · Answer

(x, y)

x values should not repeat for a relation to be a function

rational · Answer

A.
(–25, 16), (0, 16), (–25, 18)
    ^                         ^

this is not a function because -25 has repeated