Two invisible lines in a function? What are they called?

Question

anonymous · Answer

Original word problem:

anonymous · Answer

Also how would I predict?

jdoe0001 · Answer

inkyvoyd · Answer

Darn, beat me to it.

anonymous · Answer

But which ones are invisible? o.o

inkyvoyd · Answer

ALL asymptotes are invisible, although occasionally we mark them with a dotted line and labeling to give more information about the function.

jdoe0001 · Answer

anonymous · Answer

My question hints that there are only 2 though.. I'm a little confused :/

anonymous · Answer

I already knew it was going to be two asymptotes, but I posted this because I wasn't sure which the question needed.