Which of the sets of ordered pairs represents a function?

A = {(−5, 5), (−2, 2), (2, −2), (5, −5)}

B = {(4, 2), (3, −2), (9, 4), (11, −3)}
Only A
Only B
Both A and B***
Neither A nor B

Question

Which of the sets of ordered pairs represents a function? 

A = {(−5, 5), (−2, 2), (2, −2), (5, −5)} 

B = {(4, 2), (3, −2), (9, 4), (11, −3)}
 Only A 
Only B 
Both A and B***
Neither A nor B

anonymous · Answer

@ganeshie8

anonymous · Answer

Both

anonymous · Answer

are you sure?

anonymous · Answer

yes because each x value is paired with exactly one y value

anonymous · Answer

thanks I was just looking for reasoning.

anonymous · Answer

wait hold on one sec

anonymous · Answer

ok so its the opposite of what i said my mistake

anonymous · Answer

heres an example:
(2,4)
(3,4)
(5,6)
(7,4)
This IS a function because there are no repeating numbers in the x column. It doesnt matter if there are any repeats in the y column :)

anonymous · Answer

yes, so both of them are functions

anonymous · Answer

Correct!