Question

Discrete Mathematics
not sure how to go about this question please help:
http://prntscr.com/d9crwm

Answer 1

according to wikipedia
https://en.wikipedia.org/wiki/Bijection

you need an inverse, and you need one-to-one correspondence with no pair left out.

Answer 2

every unique x value will have a unique y value

Answer 3

line is your basic example, therse one more in the list of choices given

Answer 4

there are more*

Answer 5

im not sure about choice c, it is 1 to 1, and the discontinuity carries over too

Answer 6

but inf and -inf poins to the same x, going backwards, so i dont know if ud consider that a fail... it is inf and -inf after all