A linear asymptote is essentially a straight line that a graphed curve becomes closer and closer but does not become identical to.
A function can have more than one asymptote, and what is more: There are three different types of asymptotes: vertical, horizontal and oblique asymptotes.
If an asymptote is parallel with the y-axis, we call it a vertical asymptote. If an asymptote is parallel with the x-axis, we call it a horizontal asymptote. All other asymptotes are oblique asymptotes.
Vertical asymptote: A line x = a is a vertical asymptote of a function f when  or
Horizontal asymptote: A line y = a is a horizontal asymptote of a function f when  or
Oblique asymptote: A line y = mx+n is an oblique asymptote of a function f when 
Find the
Vertical asymptote(s) of the function:
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