Math Problem Statement

Graph the equation y = |2x - 7| and determine the x-intercept, intervals where the graph is increasing and decreasing.

Solution

To analyze the given equation y=2x7y = |2x - 7|, let’s go through each part of the question.

Step 1: Understanding the Graph of y=2x7y = |2x - 7|

The equation y=2x7y = |2x - 7| represents an absolute value function, which typically has a "V" shape. The vertex occurs where the expression inside the absolute value equals zero. Solving 2x7=02x - 7 = 0 gives: x=72=3.5x = \frac{7}{2} = 3.5 So, the vertex of the graph is at (3.5,0)(3.5, 0).

Step 2: Identifying the Correct Graph

To find the correct option among A, B, C, and D, we look for:

  • A V-shaped graph with its vertex at (3.5,0)(3.5, 0).
  • Increasing and decreasing portions corresponding to the behavior of the absolute value function:
    • Decreasing on (,3.5](-\infty, 3.5]
    • Increasing on [3.5,)[3.5, \infty)

Looking at the graphs in the options, Option B matches these criteria, as it has a V-shape centered at x=3.5x = 3.5 and appears symmetric about this point.

Step 3: Answering the Questions

  1. The x-intercept: The x-intercept is at the vertex, so (3.5,0)(3.5, 0).
  2. Intervals of Increase and Decrease:
    • Increasing on [3.5,)[3.5, \infty)
    • Decreasing on (,3.5](-\infty, 3.5]

Would you like more details on how I analyzed each part?

Here are five related questions to expand your understanding:

  1. How do you find the vertex of an absolute value function?
  2. Why does the absolute value function always have a V-shape?
  3. What changes in the graph if the equation is y=2x+7y = |2x + 7| instead?
  4. How do you determine the intervals of increase and decrease for absolute value functions?
  5. What would the graph look like if the equation were y=2x7y = -|2x - 7|?

Tip: In absolute value functions, the vertex represents the point where the function changes direction from decreasing to increasing.

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Math Problem Analysis

Mathematical Concepts

Absolute Value Functions
Graphing
Piecewise Functions

Formulas

y = |2x - 7|

Theorems

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Suitable Grade Level

Grades 8-10