Question

Which one of the following is a function?

3x – y^2 = 9
3x – y = 9
3x^2 – y^2 = 9

Answer 1

what do you think which one is correct answer

Answer 2

I think they're all functions. They all pass the vertical line test

Answer 3

but that isn't an option though.

Answer 4

yes it is
and you have to answer any one or all .

Answer 5

You can only pick choice so I am confused because i think they're all functions aren't they?

Answer 6

they are
but if you can choose only one option then B is correct answer

Answer 7

Why would it be B?

Answer 8

I think all of these is correct answer