# How to write an equation of a line with no y-intercept for rational function

Now, the largest exponent in the numerator and denominator is 1 and so by the fact there will be a horizontal asymptote at the line.

## How to find the y intercept of a polynomial function

Let's see if that's enough information for us to figure out if any of these choices could be the graph of y equals f of x. This line is called a vertical asymptote. Because of this we will always need to get a couple of points in these types of regions to determine just what the behavior will be. Determining asymptotes is actually a fairly simple process. Now this is really interesting. It only needs to approach it on one side in order for it to be a horizontal asymptote. The process for graphing a rational function is fairly simple. Here are the general definitions of the two asymptotes. We really can't deduce what x values make the numerator equals zero or what x values make the denominator equal zero. It looks just eyeballing it at one, x equals zero, y is one.

Here is a sketch of this graph. Determining asymptotes is actually a fairly simple process.

So we're actually able to figure out what f of zero is. So they gave us four choices here.

So this 12 looks like a pretty big clue. Next, notice that this graph does not have any intercepts of any kind.

### Graphing simple rational functions

Process for Graphing a Rational Function Find the intercepts, if there are any. So they gave us four choices here. They didn't even tell us what the exponents on x are. We really can't deduce what x values make the numerator equals zero or what x values make the denominator equal zero. This line is called a horizontal asymptote. And so we can figure out f of zero. So choice a, our y intercept is a two. Now, the largest exponent in the numerator and denominator is 1 and so by the fact there will be a horizontal asymptote at the line. Next, notice that this graph does not have any intercepts of any kind. It's 12 over 12 or one. In each region graph at least one point in each region. We were able to figure out any of the other, you know, the zeros or the vertical asymptotes or their removable discontinuities. Now this is really interesting. All right, now let's work to this together.

This line is called a horizontal asymptote. Well, that's just going to be zero. Almost all rational functions will have graphs in multiple pieces like this.

## Horizontal asymptote

In each region graph at least one point in each region. Example 2 Sketch the graph of the following function. Let's see if that's enough information for us to figure out if any of these choices could be the graph of y equals f of x. It looks just eyeballing it at one, x equals zero, y is one. All right, now let's work to this together. Plus 12 over c times zero to the m power. Choice C has its y intercept at y is equal to negative one. First, notice that the graph is in two pieces. So we definitely feel good about that choice. Once we have these solutions we just need to check that none of them make the denominator zero as well. D times zero is going to be a zero.

The process for graphing a rational function is fairly simple. So what can that tell us? Let's see if that's enough information for us to figure out if any of these choices could be the graph of y equals f of x.

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