Math Problem Statement

Graph the equation y = |2x - 3| by hand. (a) Find the x-intercept. (b) Determine where the graph is increasing and where it is decreasing.

Solution

The given equation is y=2x3y = |2x - 3|.

(a) Find the x-intercept:

To find the x-intercept, set y=0y = 0 and solve for xx: 0=2x30 = |2x - 3| The absolute value equation 2x3=0|2x - 3| = 0 is true when: 2x3=0    x=322x - 3 = 0 \implies x = \frac{3}{2}

So, the x-intercept is (32,0)\left(\frac{3}{2}, 0\right).

(b) Determine where the graph is increasing and where it is decreasing:

The graph of an absolute value function like y=2x3y = |2x - 3| forms a V-shape. It has a vertex where the expression inside the absolute value equals zero: 2x3=0    x=322x - 3 = 0 \implies x = \frac{3}{2}

  • Increasing: For x>32x > \frac{3}{2}, the function increases because the slope of 2x32x - 3 is positive.
  • Decreasing: For x<32x < \frac{3}{2}, the function decreases as the slope is negative on this side of the vertex.

Graph Identification:

Given the V-shape nature of the graph and the vertex at x=32x = \frac{3}{2}, the correct graph should show a V with its vertex at (32,0)\left(\frac{3}{2}, 0\right). From the provided options (A, B, C, D), we need to select the graph that matches this description.

Based on the x-intercept and the shape of the graph around x=32x = \frac{3}{2}, the correct answer is Option D.

Would you like further details or have any questions about this solution?

Related Questions:

  1. What is the vertex form of an absolute value function?
  2. How do absolute value functions change when you alter the coefficients?
  3. How do you find the y-intercept of y=2x3y = |2x - 3|?
  4. What is the general form of the graph of an absolute value function?
  5. How does the graph of y=2x3y = |2x - 3| compare to y=2x3y = 2x - 3?

Tip:

For absolute value functions of the form y=ax+by = |ax + b|, the graph always has a V-shape with the vertex at the point where ax+b=0ax + b = 0.

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Math Problem Analysis

Mathematical Concepts

Absolute Value Functions
Graphing
Intercepts
Increasing and Decreasing Functions

Formulas

y = |2x - 3|
Finding x-intercept by setting y = 0

Theorems

Absolute Value Function Theorem

Suitable Grade Level

Grades 9-12