Math Problem Statement

Write a piecewise function represented by the graph.

A graph of a piecewise function. One linear piece goes through ordered pair negative 4 comma negative 6 and ends at a closed dot at ordered pair negative 2 comma negative 2. A second linear piece begins at the same closed dot at ordered pair negative 2 comma negative 2 and goes through ordered pair 2 comma 0.

Solution

To write the piecewise function represented by the graph, we need to define each linear piece separately.

Step 1: First Linear Piece (From x=4x = -4 to x=2x = -2)

The first segment goes through the points (4,6)(-4, -6) and (2,2)(-2, -2). We will determine the equation of the line using the slope-intercept form y=mx+by = mx + b.

Find the slope mm:

m=y2y1x2x1=2(6)2(4)=2+62+4=42=2m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{-2 - (-6)}{-2 - (-4)} = \frac{-2 + 6}{-2 + 4} = \frac{4}{2} = 2

So, the slope m=2m = 2.

Use point-slope form to find the equation:

Using point (4,6)(-4, -6) and the slope m=2m = 2, the equation of the line is: yy1=m(xx1)y - y_1 = m(x - x_1) y(6)=2(x(4))y - (-6) = 2(x - (-4)) y+6=2(x+4)y + 6 = 2(x + 4) y=2x+86y = 2x + 8 - 6 y=2x+2y = 2x + 2

Thus, the equation for the first piece is y=2x+2y = 2x + 2, valid for x[4,2]x \in [-4, -2].

Step 2: Second Linear Piece (From x=2x = -2 to x=2x = 2)

The second segment goes through the points (2,2)(-2, -2) and (2,0)(2, 0).

Find the slope mm:

m=0(2)2(2)=0+22+2=24=12m = \frac{0 - (-2)}{2 - (-2)} = \frac{0 + 2}{2 + 2} = \frac{2}{4} = \frac{1}{2}

So, the slope m=12m = \frac{1}{2}.

Use point-slope form to find the equation:

Using point (2,2)(-2, -2) and the slope m=12m = \frac{1}{2}, the equation of the line is: y(2)=12(x(2))y - (-2) = \frac{1}{2}(x - (-2)) y+2=12(x+2)y + 2 = \frac{1}{2}(x + 2) y+2=12x+1y + 2 = \frac{1}{2}x + 1 y=12x+12y = \frac{1}{2}x + 1 - 2 y=12x1y = \frac{1}{2}x - 1

Thus, the equation for the second piece is y=12x1y = \frac{1}{2}x - 1, valid for x(2,2]x \in (-2, 2].

Piecewise Function:

Now, we can write the piecewise function:

\begin{cases} 2x + 2 & \text{if } -4 \leq x \leq -2 \\ \frac{1}{2}x - 1 & \text{if } -2 < x \leq 2 \end{cases}$$ Would you like further details on any part of this? Here are some related questions to deepen your understanding: 1. How do you find the slope between two points? 2. What is the point-slope form of a line, and when is it used? 3. Can a piecewise function be continuous? Why or why not? 4. How would you graph this piecewise function? 5. What is the domain of this piecewise function? **Tip:** When working with piecewise functions, always check if the pieces are connected at the boundary points!

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Math Problem Analysis

Mathematical Concepts

Piecewise Functions
Linear Equations
Graph Interpretation

Formulas

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

Theorems

Linearity of Piecewise Functions

Suitable Grade Level

Grades 9-12