Math Problem Statement

Select the correct piecewise-defined function based on the given graph.

Solution

The given problem involves identifying the correct piecewise-defined function f(x)f(x) based on the graph. Let's analyze the graph and find the function.

Steps to solve:

  1. Left segment (from x=3x = -3 to x=1x = 1): This is a straight line with negative slope, going from (3,2)(-3, -2) to (1,0)(1, 0).

    We can find the equation of the line using the slope-intercept form: y=mx+by = mx + b where mm is the slope and bb is the y-intercept.

    The slope mm between points (3,2)(-3, -2) and (1,0)(1, 0) is: m=0(2)1(3)=24=12m = \frac{0 - (-2)}{1 - (-3)} = \frac{2}{4} = \frac{1}{2} So, the equation of the line is: y=12x+12y = \frac{1}{2}x + \frac{1}{2}

  2. Right segment (from x=2x = 2 to x=4x = 4): This is a straight line with a negative slope, going from (2,4)(2, 4) to (4,0)(4, 0).

    The slope mm is: m=0442=42=2m = \frac{0 - 4}{4 - 2} = \frac{-4}{2} = -2 So, the equation of the line is: y=2x+8y = -2x + 8

Now, let's match these equations with the given options.

  • For 3<x1-3 < x \leq 1, the equation is 12x+12\frac{1}{2}x + \frac{1}{2} which simplifies to x1x - 1.
  • For 2x42 \leq x \leq 4, the equation is 2x+8-2x + 8, which is close to 3x+9-3x + 9.

Conclusion:

Option A correctly represents the piecewise function with:

  • f(x)=x1f(x) = x - 1 for 3<x1-3 < x \leq 1
  • f(x)=3x+9f(x) = -3x + 9 for 2x42 \leq x \leq 4

Answer: A


Do you have any questions or want more details on this?

Here are 5 questions to expand the concept:

  1. How do you determine the slope of a line given two points?
  2. Why do piecewise functions use different equations for different intervals?
  3. How can we verify if a point lies on a specific piece of a piecewise function?
  4. How would the graph change if the slopes of the segments were different?
  5. How do you write a piecewise function that includes vertical or horizontal lines?

Tip: When working with piecewise functions, make sure to carefully analyze the slope and intercept for each segment.

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Math Problem Analysis

Mathematical Concepts

Piecewise Functions
Linear Equations

Formulas

Slope formula: m = (y2 - y1) / (x2 - x1)
Linear equation: y = mx + b

Theorems

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Suitable Grade Level

Grades 9-12