Which of the sets of ordered pairs represents a function?

A = {(1, −2), (3, −5), (5, 2), (7, 5)}

B = {(4, 2), (4, −2), (9, 3), (9, −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 = {(1, −2), (3, −5), (5, 2), (7, 5)} 

B = {(4, 2), (4, −2), (9, 3), (9, −3)}

 Only A
 Only B
 Both A and B
 Neither A nor B

anonymous · Answer

Is it possible to have an x coordinate with 2 y coordinates?

anonymous · Answer

i dont think so so its D

anonymous · Answer

it's not possible. Why do you think it's D?

anonymous · Answer

because 4 cant have 2 and -2 it can only have 1 answer for each input because the function has to stay the same for ever input

anonymous · Answer

I think the answer is A

anonymous · Answer

then whats the function

brynndelyn · Answer

A function can't have two repeating x coordinates

anonymous · Answer

we already said that -_-

♪chibiterasu · Answer

A function simply cannot have more than one Y value for an X value, that's not possible. Set B presents 3 Y values for 9 and 2 for 4. A does not have any repeating X values, making it the only function here.

brynndelyn · Answer

So look at each group of ordered pairs and see if any of the x's repeat...if so then it's not a function

anonymous · Answer

so its D

♪chibiterasu · Answer

No .  ..

♪chibiterasu · Answer

Do you see any repeating X values in set A?

anonymous · Answer

no but it cant have negetive and positive numbers like that is A

anonymous · Answer

if it is A then what is the function

anonymous · Answer

@dan815