Math Problem Statement

Solve the following system of inequalities graphically on the set of axes below. State the coordinates of a point in the solution set. y < 2x - 5 y ≤ -x - 2

Solution

To solve the given system of inequalities graphically:

  1. Inequalities:
    • y<2x5y < 2x - 5
    • yx2y \leq -x - 2

Step 1: Understanding Each Inequality

  1. For y<2x5y < 2x - 5:

    • The equation y=2x5y = 2x - 5 represents a straight line with slope m=2m = 2 and yy-intercept at 5-5.
    • The inequality y<2x5y < 2x - 5 means the solution region is below this line. The line will be dashed to indicate that points on the line are not included.
  2. For yx2y \leq -x - 2:

    • The equation y=x2y = -x - 2 represents a straight line with slope m=1m = -1 and yy-intercept at 2-2.
    • The inequality yx2y \leq -x - 2 means the solution region is below or on this line. The line will be solid to indicate that points on the line are included.

Step 2: Graphing Both Lines

  • Plot y=2x5y = 2x - 5: Start at (0,5)(0, -5), use the slope 22 (rise 2, run 1).
  • Plot y=x2y = -x - 2: Start at (0,2)(0, -2), use the slope 1-1 (rise -1, run 1).
  • Shade the regions:
    • Below the dashed line y=2x5y = 2x - 5.
    • Below or on the solid line y=x2y = -x - 2.

Step 3: Identifying the Solution Region

The solution region is where both shaded regions overlap. It lies:

  • Below the dashed line y=2x5y = 2x - 5.
  • Below or on the solid line y=x2y = -x - 2.

Step 4: Point in the Solution Set

Choose a test point within the overlapping region. For example:

  • Point (0,4)(0, -4):
    • Check against y<2x5y < 2x - 5: 4<2(0)5    4<5-4 < 2(0) - 5 \implies -4 < -5 → False.

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Math Problem Analysis

Mathematical Concepts

Linear Inequalities
Graphing Linear Equations
Coordinate Geometry

Formulas

Slope-intercept form: y = mx + b

Theorems

Concept of solution region for inequalities

Suitable Grade Level

Grades 8-10