Hi,

This is on the Barron SAT Math II page 17 # 28

Which of the following lines are asymptotes of the graph of y=$\displaystyle frac{x}{x+1}$?

I. x=1

II. x=-1

III. y=1

(For the answer you can choose two or more, or even none if its all incorrect.)

I know that x=1 is WRONG, and that x=-1 is CORRECT. But what about y=1? Why is it also an asymptote?

Thanks in advance