Math Problem Statement

With the parent function being f(x) = 2/3x - 9, how would you write the function when reflected over the y-axis?

Solution

The question asks how to reflect the function f(x)=23x9f(x) = \frac{2}{3}x - 9 over the y-axis.

When a function is reflected over the y-axis, we replace xx with x-x in the function. So, let's reflect the function step by step:

  1. Start with the original function: f(x)=23x9f(x) = \frac{2}{3}x - 9

  2. To reflect over the y-axis, replace xx with x-x: g(x)=23(x)9g(x) = \frac{2}{3}(-x) - 9

  3. Simplify: g(x)=23x9g(x) = -\frac{2}{3}x - 9

Thus, the reflected function is: g(x)=23x9g(x) = -\frac{2}{3}x - 9

This corresponds to the third option in your quiz: g(x) = -23x9\frac{2}{3}x - 9.

Let me know if you want any further details!


Here are five follow-up questions related to this concept:

  1. How does reflecting a function over the x-axis differ from reflecting over the y-axis?
  2. What happens to the slope when a linear function is reflected over the y-axis?
  3. If f(x)=ax+bf(x) = ax + b, what will the reflected function over the y-axis be in general terms?
  4. How would you reflect a quadratic function over the y-axis?
  5. Can a function remain unchanged when reflected over the y-axis? If so, what type of function?

Tip: To reflect a function over the y-axis, simply replace xx with x-x in the function equation!

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Math Problem Analysis

Mathematical Concepts

Algebra
Function Transformations
Reflections

Formulas

Reflection over the y-axis: replace x with -x

Theorems

Transformation Rules for Functions

Suitable Grade Level

Grades 8-10