Math Problem Statement

Draw a graph of \( f(x) = \frac{x - 6}{x - 2} \) by first placing the horizontal and vertical asymptotes, then plotting an additional point on the graph.

Solution

To graph f(x)=x6x2f(x) = \frac{x - 6}{x - 2} by placing the horizontal and vertical asymptotes, let's analyze the function and determine these asymptotes.

Step 1: Determine Vertical Asymptote

The vertical asymptote occurs where the denominator is zero (since division by zero is undefined). For this function:

x2=0x=2x - 2 = 0 \Rightarrow x = 2

Thus, there is a vertical asymptote at x=2x = 2.

Step 2: Determine Horizontal Asymptote

For rational functions of the form ax+bcx+d\frac{ax + b}{cx + d}, the horizontal asymptote can be determined by comparing the degrees of the numerator and denominator. If the degrees are the same, the horizontal asymptote is the ratio of the leading coefficients.

In this case, both the numerator and denominator are of degree 1. The leading coefficient in the numerator is 1, and in the denominator, it is also 1. Therefore:

Horizontal Asymptote: y=11=1\text{Horizontal Asymptote: } y = \frac{1}{1} = 1

So, the horizontal asymptote is y=1y = 1.

Step 3: Plot an Additional Point

To get a sense of the graph's shape, let’s pick a point. We can choose x=0x = 0 for simplicity:

f(0)=0602=62=3f(0) = \frac{0 - 6}{0 - 2} = \frac{-6}{-2} = 3

So, (0,3)(0, 3) is a point on the graph.

Summary

  1. Vertical Asymptote at x=2x = 2.
  2. Horizontal Asymptote at y=1y = 1.
  3. Point (0,3)(0, 3) as an additional point on the graph.

Now, you can plot these elements on the grid:

  • Draw a dashed vertical line at x=2x = 2 to represent the vertical asymptote.
  • Draw a dashed horizontal line at y=1y = 1 to represent the horizontal asymptote.
  • Plot the point (0,3)(0, 3).

Would you like more details on any of these steps, or have any other questions?


Here are 5 questions for further exploration:

  1. What happens to f(x)f(x) as xx approaches the vertical asymptote from both sides?
  2. How does the behavior of f(x)f(x) change as xx \to \infty or xx \to -\infty?
  3. How would the graph of f(x)=x6x2f(x) = \frac{x - 6}{x - 2} change if the numerator or denominator were altered?
  4. What would be the effect of adding a constant to the entire function f(x)f(x)?
  5. How can you determine the slant asymptote for a function where the degree of the numerator is one higher than the denominator?

Tip: Always examine both the horizontal and vertical asymptotes to understand the end behavior and restrictions of rational functions before plotting additional points.

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Math Problem Analysis

Mathematical Concepts

Rational Functions
Asymptotes
Graphing

Formulas

Vertical asymptote occurs where denominator = 0
Horizontal asymptote for rational functions with same-degree numerator and denominator: y = leading coefficient of numerator / leading coefficient of denominator

Theorems

Asymptote Behavior of Rational Functions

Suitable Grade Level

Grades 10-12