# How to Find Vertical Asymptote of a Rational Equation - Definition, Example

## How to Find Vertical Asymptote of a Rational Equation - Tutorial

#### Definition:

An asymptote is a line that a graph approaches, but does not intersect. In this lesson, we will learn how to find vertical asymptotes, horizontal asymptotes and oblique (slant) asymptotes of rational functions.

#### Method 1:

When the line y = L , then its called as horizontal asymptote of the curve y = f(x) if either #### Method 2:

For the rational function, f(x) y= 0 is the vertical asymptote when the polynomial degree of x in the numerator is less than the polynomial degree of x in the denominator. If the polynomial degree of x is same in the numerator and denominator then y = c, where c is obtained by dividing the leading coefficients

#### Example:

Find the vertical asymptotes of equation #### Method 1:

Here though x is larger its close to 3, 2x is close to 8 and the value of the denominator x – 3 is the small positive integer. is a large positive number. Intuitively, we see that Likewise, if x is smaller and close to 3, 2x is close to 8 and the value of the denominator x – 3 is the small negative value. Below shown f(x) is a large negative number.  The line x = 3 is the vertical asymptote.

#### Method 2:

f(x) is in reduced form. X – 3 is the denominator, so the Vertical Asymptote is at x = 3.