Which of the following does not represent a function?

x −12 −5 11 14 17
y −5 −2 −2 8 34

x −10 1 3 8 10
y −2 2 7 8 10

x 5 10 10 12 18
y 1 4 22 5 4

x 4 5 6 8 10
y 4 −4 12 −8 6

Question

Which of the following does not represent a function? 

 x −12 −5 11 14 17 
y −5 −2 −2 8 34 


 x −10 1 3 8 10 
y −2 2 7 8 10 


 x 5 10 10 12 18 
y 1 4 22 5 4 


 x 4 5 6 8 10 
y 4 −4 12 −8 6

anonymous · Answer

a function, or mapping from x to y, must have unique x's

anonymous · Answer

i dont under stand

anonymous · Answer

"Unique" means no repeats

hoblos · Answer

in a function.. for every value of x there must be a unique value of y
so if for the same value of x we have 2 or more values of y it is not a function

so here in the third choice we have two y-values for x=10.. so it is not a function