Which of the following does not represent a function?

x −2 0 1 −2 9
y 0 −1 −2 −3 −4

x 3 6 9 12 18
y 2 4 6 8 10

x −3 −1 0 2 4
y −6 −4 −3 −2 −1

x 8 7 4 3 1
y −7 −5 −3 −2 −1

Question

Which of the following does not represent a function?
 	
	
x	−2	0	1	−2	9
y	0	−1	−2	−3	−4
	
x	3	6	9	12	18
y	2	4	6	8	10
	
x	−3	−1	0	2	4
y	−6	−4	−3	−2	−1
	
x	8	7	4	3	1
y	−7	−5	−3	−2	−1

nnesha · Answer

if x values are repeat then its not a function

nnesha · Answer

if you have same x values more then one then its not function 
let me know if you get it

anonymous · Answer

The 1st one

nnesha · Answer

ist one have same two values -2( two times )

nnesha · Answer

ohh yeah right

nnesha · Answer

sorry i thought you have to find function 
really sorry

anonymous · Answer

Its fine. :) thank you.