Can you have a horizontal and slant asymptote?

Asked By: Achim Panayotov | Last Updated: 17th May, 2020
Category: science space and astronomy
4.2/5 (232 Views . 21 Votes)
You may have 0 or 1 slant asymptote, but no more than that. A graph can have both a vertical and a slant asymptote, but it CANNOT have both a horizontal and slant asymptote. You draw a slant asymptote on the graph by putting a dashed horizontal (left and right) line going through y = mx + b.

Click to see full answer


Also know, can a slant asymptote be crossed?

NOTE: A common mistake that students make is to think that a graph cannot cross a slant or horizontal asymptote. This is not the case! A graph CAN cross slant and horizontal asymptotes (sometimes more than once). It's those vertical asymptote critters that a graph cannot cross.

Furthermore, what are the rules for horizontal asymptotes? The three rules that horizontal asymptotes follow are based on the degree of the numerator, n, and the degree of the denominator, m.

  • If n < m, the horizontal asymptote is y = 0.
  • If n = m, the horizontal asymptote is y = a/b.
  • If n > m, there is no horizontal asymptote.

Keeping this in consideration, what is the equation of the horizontal or oblique asymptote?

Case 1: If the degree of the numerator of f(x) is less than the degree of the denominator, i.e. f(x) is a proper rational function, the x-axis (y = 0) will be the horizontal asymptote. The line y = mx + b is an oblique asymptote for the graph of f(x), if f(x) gets close to mx + b as x gets really large or really small.

What is a horizontal asymptote definition?

Horizontal asymptotes are horizontal lines that the graph of the function approaches as x tends to +∞ or −∞. As the name indicates they are parallel to the x-axis. Vertical asymptotes are vertical lines (perpendicular to the x-axis) near which the function grows without bound.

28 Related Question Answers Found

What happens when there is no horizontal asymptote?

If the polynomial in the numerator is a lower degree than the denominator, the x-axis (y = 0) is the horizontal asymptote. If the polynomial in the numerator is a higher degree than the denominator, there is no horizontal asymptote.

How do you find Asymptotes?

The horizontal asymptote of a rational function can be determined by looking at the degrees of the numerator and denominator.
  1. Degree of numerator is less than degree of denominator: horizontal asymptote at y = 0.
  2. Degree of numerator is greater than degree of denominator by one: no horizontal asymptote; slant asymptote.

Why is there a horizontal asymptote?

An asymptote is a line that a graph approaches without touching. Similarly, horizontal asymptotes occur because y can come close to a value, but can never equal that value. In the previous graph, there is no value of x for which y = 0 ( ≠ 0), but as x gets very large or very small, y comes close to 0.

How do you know if a rational function is symmetrical?

Test to see if the graph has symmetry by plugging in (-x) in the function. Options: If the signs all stay the same or all change, f(-x) = f(x), then you have even or y-axis symmetry. If either the numerator or the denominator changes signs completely, f(-x)= -f(x) then you have odd, or origin symmetry.

When can you cross the horizontal asymptote?


The graph of f can intersect its horizontal asymptote. As x → ± ∞, f(x) → y = ax + b, a ≠ 0 or The graph of f can intersect its horizontal asymptote.

How do you find the Y intercept?

To find the y intercept using the equation of the line, plug in 0 for the x variable and solve for y. If the equation is written in the slope-intercept form, plug in the slope and the x and y coordinates for a point on the line to solve for y.

How do you find the range of a rational function?

To find the excluded value in the domain of the function, equate the denominator to zero and solve for x . So, the domain of the function is set of real numbers except −3 . The range of the function is same as the domain of the inverse function. So, to find the range define the inverse of the function.

How do you find an oblique asymptote?

A slant (oblique) asymptote occurs when the polynomial in the numerator is a higher degree than the polynomial in the denominator. To find the slant asymptote you must divide the numerator by the denominator using either long division or synthetic division. Examples: Find the slant (oblique) asymptote.

Can you have a horizontal and oblique asymptote?


You may have 0 or 1 slant asymptote, but no more than that. A graph can have both a vertical and a slant asymptote, but it CANNOT have both a horizontal and slant asymptote. You draw a slant asymptote on the graph by putting a dashed horizontal (left and right) line going through y = mx + b.

How do you find a vertical asymptote?

To find the vertical asymptote(s) of a rational function, simply set the denominator equal to 0 and solve for x. We mus set the denominator equal to 0 and solve: This quadratic can most easily be solved by factoring the trinomial and setting the factors equal to 0. There are vertical asymptotes at .

How do you find the asymptotes of a rational function?

Process for Graphing a Rational Function
  1. Find the intercepts, if there are any.
  2. Find the vertical asymptotes by setting the denominator equal to zero and solving.
  3. Find the horizontal asymptote, if it exists, using the fact above.
  4. The vertical asymptotes will divide the number line into regions.
  5. Sketch the graph.

How do you find the horizontal asymptote of top heavy?

If the degree of the numerator (up top) is smaller than the degree of the denominator (down below), then the horizontal asymptote is the x-axis itself (y = 0). If the degree of the numerator (top dog) is equal to the degree of the denominator (down low Joe), then we look at the leading coefficient of each polynomial.

How do you find the domain of a function?

For this type of function, the domain is all real numbers. A function with a fraction with a variable in the denominator. To find the domain of this type of function, set the bottom equal to zero and exclude the x value you find when you solve the equation. A function with a variable inside a radical sign.