Which relation is a function?

A.
x −2 −2 0 1 8
y 3 6 0 0 9

B.
x 3 5 7 14 14
y −9 5 −9 1 2

C.
x −3 4 5 9 12
y 1 −2 −2 0 7

D.
x −7 −5 6 8 8
y −3 8 1 1 −9

Question

Which relation is a function?
 
 A.
x	−2	−2	0	1	8
y	3	6	0	0	9
 
 
 B.
x	3	5	7	14	14
y	−9	5	−9	1	2
 
 
 C.
x	−3	 4	5	9	12
y	1	−2	−2	0	7
 
 
 D.
x	−7	−5	 6	 8	8
y	−3	8	1	1	−9

anonymous · Answer

@KamiBug

directrix · Answer

@OGangsta

No x can go to to two different y values for that x if the relation is a function.

The only option in which that does not happen is this;

 C. x −3 4 5 9 12 y 1 −2 −2 0 7