Which relation is a function?

A.

(5, –2), (4, 6), (–3, –2), (0, 4)

B.

(–1, –2), (3, –5), (–1, –5), (2, –2)

C.

(4, 3), (3, 2), (–1, 5), (4, 0)

D.

(–4, –4), (3, –3), (–4, 4), (–3, 3)

Question

Which relation is a function?




A. 

(5, –2), (4, 6), (–3, –2), (0, 4) 


B. 

(–1, –2), (3, –5), (–1, –5), (2, –2) 


C. 

(4, 3), (3, 2), (–1, 5), (4, 0) 


D. 

(–4, –4), (3, –3), (–4, 4), (–3, 3)

blurbendy · Answer

The first one.  in the other ones, one input maps to different ouputs which is not a function by definition

anonymous · Answer

Same element must not have two images..that is preimages should be unique..so first one is the function