en.wikipedia.org/wiki/Asymptote

In analytic geometry, an **asymptote** of a curve is a line such that the distance
between the curve and the line approaches ...

www.purplemath.com/modules/asymtote2.htm

Uses worked examples to explain how to find **horizontal asymptotes**. Explains
how functions and their graphs get "close" to **horizontal asymptotes**, and shows ...

www.coolmath.com/precalculus-review-calculus-intro/precalculus-algebra/18-rational-functions-finding-horizontal-slant-asymptotes-01

This Precalculus review (Calculus preview) lesson explains how to find the
**horizontal** (or slant) **asymptotes** when graphing rational functions.

www.softschools.com/math/calculus/finding_horizontal_asymptotes_of_rational_functions

Finding **Horizontal Asymptotes** of Rational Functions. Remember that an
asymptote is a line that the graph of a function approaches but never touches.
Rational ...

www.khanacademy.org/math/algebra2/rational-expressions-equations-and-functions/graphs-of-rational-functions/v/graphs-of-rational-functions-horizontal-asymptote

The question seeks to gauge your understanding of **horizontal asymptotes** of
rational functions. The behavior of rational functions (ratios of polynomial
functions) ...

www.khanacademy.org/math/algebra2/rational-expressions-equations-and-functions/graphs-of-rational-functions/v/finding-asymptotes-example

Sal analyzes the function f(x)=(3x^2-18x-81)/(6x^2-54) and determines its
**horizontal asymptotes**, vertical asymptotes, and removable discontinuities.

www.freemathhelp.com/finding-horizontal-asymptotes.html

**Horizontal asymptotes** are approached by the curve of a function as x goes
towards infinity. Calculate their value algebraically and see graphical examples
with ...

magoosh.com/hs/ap-calculus/2017/function-two-horizontal-asymptotes

Jan 6, 2017 **...** The answer is no, a function cannot have more than two **horizontal asymptotes**.
But let's take some time to find out why.