Math Problem Statement

Write a piecewise function for the given graph.

Solution

Let's analyze the given graph to write the piecewise function.

Steps to solve:

  1. The graph is made of two line segments with different slopes.

  2. Identify the equations of the two lines:

    • For x2x \geq -2: This segment runs from point (2,5)(-2, -5) to (5,2)(5, 2). We need to find the slope and the equation.
    • For x<2x < -2: This segment runs from (4,4)(-4, 4) to (2,5)(-2, -5). Similarly, we find the slope and equation.

Step 1: Equation for x2x \geq -2

The two points on this line are (2,5)(-2, -5) and (5,2)(5, 2).

  • Slope: m=2(5)5(2)=77=1m = \frac{2 - (-5)}{5 - (-2)} = \frac{7}{7} = 1

  • Equation: Using point-slope form yy1=m(xx1)y - y_1 = m(x - x_1), with point (2,5)(-2, -5): y+5=1(x+2)y + 5 = 1(x + 2) Simplifying: y=x3y = x - 3

Thus, for x2x \geq -2, the equation is f(x)=x3f(x) = x - 3.

Step 2: Equation for x<2x < -2

The two points on this line are (4,4)(-4, 4) and (2,5)(-2, -5).

  • Slope: m=542(4)=92m = \frac{-5 - 4}{-2 - (-4)} = \frac{-9}{2}

  • Equation: Using point-slope form with point (2,5)(-2, -5): y+5=92(x+2)y + 5 = -\frac{9}{2}(x + 2) Simplifying: y=92(x+2)5y = -\frac{9}{2}(x + 2) - 5 Expand: y=92x95y = -\frac{9}{2}x - 9 - 5 y=92x14y = -\frac{9}{2}x - 14

Thus, for x<2x < -2, the equation is f(x)=92x14f(x) = -\frac{9}{2}x - 14.

Final Piecewise Function:

\begin{cases} x - 3 & \text{if } x \geq -2 \\ -\frac{9}{2}x - 14 & \text{if } x < -2 \end{cases}$$ Would you like further clarification on this? Here are some questions to expand your understanding: 1. How is the slope of a line calculated from two points? 2. Why do we use point-slope form to find the equation of a line? 3. What does the piecewise function represent in terms of the graph? 4. How would the function change if the lines were curved instead of straight? 5. What other methods can be used to define a piecewise function? **Tip:** In piecewise functions, always pay attention to whether the endpoint is included or excluded, as indicated by the inequality.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Piecewise Functions
Linear Equations
Graphing

Formulas

Point-slope form of a line: y - y1 = m(x - x1)
Slope formula: m = (y2 - y1) / (x2 - x1)

Theorems

Equation of a line

Suitable Grade Level

Grades 9-12