Math Problem Statement

Solve the following system of inequalities graphically: y < (1/2)x + 3 and y < -2x - 7. State the coordinates of a point in the solution set.

Solution

The task involves solving a system of linear inequalities graphically and identifying a point in the solution set. Here's the approach:

1. Rewrite the Inequalities:

  • First inequality: y<12x+3y < \frac{1}{2}x + 3
  • Second inequality: y<2x7y < -2x - 7

These are already in slope-intercept form (y=mx+by = mx + b).

2. Graph the Lines:

  • For y=12x+3y = \frac{1}{2}x + 3:

    • Slope (mm) is 12\frac{1}{2} and y-intercept (bb) is 33.
    • Plot the y-intercept at (0,3)(0, 3).
    • Use the slope 12\frac{1}{2} to find another point: from (0,3)(0, 3), go up 1 and right 2 to (2,4)(2, 4).
    • Draw a dashed line (inequality is strict, <<).
  • For y=2x7y = -2x - 7:

    • Slope (mm) is 2-2 and y-intercept (bb) is 7-7.
    • Plot the y-intercept at (0,7)(0, -7).
    • Use the slope 2-2: from (0,7)(0, -7), go down 2 and right 1 to (1,9)(1, -9).
    • Draw a dashed line.

3. Shade the Regions:

  • For y<12x+3y < \frac{1}{2}x + 3: Shade below the line y=12x+3y = \frac{1}{2}x + 3.
  • For y<2x7y < -2x - 7: Shade below the line y=2x7y = -2x - 7.

The solution set is the overlapping shaded region below both lines.

4. Identify a Point:

From the graph:

  • A point in the overlapping region could be (6,10)(-6, -10).

Would you like detailed guidance on graphing or solving similar problems?

Here are related questions for practice:

  1. How do you determine the solution region for linear inequalities graphically?
  2. What does the slope of a line represent, and how is it used in graphing?
  3. Why are dashed lines used for inequalities with << or >>?
  4. How can you verify if a point lies in the solution set of a system of inequalities?
  5. What happens when two inequality regions do not overlap?

Tip: Always test a point (like (0,0)(0, 0)) in each inequality to verify the correct shading!

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Math Problem Analysis

Mathematical Concepts

Algebra
Graphing Inequalities
Linear Equations

Formulas

Slope-intercept form: y = mx + b
Graphical solution of inequalities

Theorems

Slope of a line
Graphical representation of inequalities

Suitable Grade Level

Grades 8-10