Math Problem Statement

Find the inverse function in slope-intercept form (mx+b): f(x)=1/2x-3

Solution

To find the inverse of the function f(x)=12x3f(x) = \frac{1}{2}x - 3, follow these steps:

Step 1: Replace f(x)f(x) with yy

Start by rewriting the function: y=12x3y = \frac{1}{2}x - 3

Step 2: Swap xx and yy

To find the inverse, switch xx and yy: x=12y3x = \frac{1}{2}y - 3

Step 3: Solve for yy

Now, solve for yy in terms of xx.

  1. Add 3 to both sides: x+3=12yx + 3 = \frac{1}{2}y

  2. Multiply both sides by 2 to get rid of the fraction: 2(x+3)=y2(x + 3) = y

Thus, the inverse function is: f1(x)=2(x+3)orf1(x)=2x+6f^{-1}(x) = 2(x + 3) \quad \text{or} \quad f^{-1}(x) = 2x + 6

So, the inverse function in slope-intercept form is: f1(x)=2x+6f^{-1}(x) = 2x + 6

Would you like more details on this process or have any questions?

Related Questions:

  1. How do you verify that two functions are inverses of each other?
  2. What is the geometric interpretation of the inverse of a linear function?
  3. How do changes in the slope or intercept of a function affect its inverse?
  4. Can a function have more than one inverse? Why or why not?
  5. How do you find the inverse of non-linear functions?

Tip:

When finding an inverse function, remember that switching xx and yy represents reflecting the graph across the line y=xy = x.

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Math Problem Analysis

Mathematical Concepts

Algebra
Inverse Functions
Linear Equations

Formulas

y = mx + b (Slope-Intercept Form)
Inverse Function Process (swap x and y, solve for y)

Theorems

Properties of Inverse Functions
Reflection across the line y = x

Suitable Grade Level

Grades 9-11