Math Problem Statement

The region R, shown shaded in the diagram, is bounded by three straight lines. Find the inequalities that define R.

Solution

To define the inequalities that bound the shaded region RR, let's analyze the three lines shown in the graph.

Step 1: Determine the Equations of the Lines

  1. Vertical Line at x=1x = -1: This line runs vertically through x=1x = -1, so its equation is: x=1x = -1 Since the shaded region RR is to the right of this line, the inequality is: x1x \geq -1

  2. Horizontal Line at y=1y = 1: This line runs horizontally through y=1y = 1, so its equation is: y=1y = 1 The shaded region is below this line, so the inequality is: y1y \leq 1

  3. Sloped Line Passing Through Points: The third line is slanted and appears to pass through points (3,2)(-3, -2) and (1,4)(1, 4). To find its equation, let's calculate the slope mm and then use the point-slope form of a line equation.

    • Slope mm: m=4(2)1(3)=4+21+3=64=32m = \frac{4 - (-2)}{1 - (-3)} = \frac{4 + 2}{1 + 3} = \frac{6}{4} = \frac{3}{2}
    • Equation of the Line: Using the point-slope form yy1=m(xx1)y - y_1 = m(x - x_1) with point (1,4)(1, 4), y4=32(x1)y - 4 = \frac{3}{2}(x - 1) Expanding and simplifying, y4=32x32y - 4 = \frac{3}{2}x - \frac{3}{2} y=32x+52y = \frac{3}{2}x + \frac{5}{2}

    Since the shaded region is below this line, the inequality is: y32x+52y \leq \frac{3}{2}x + \frac{5}{2}

Final Inequalities Defining Region RR

Combining these, the inequalities that define the shaded region RR are:

x \geq -1 \\ y \leq 1 \\ y \leq \frac{3}{2}x + \frac{5}{2} \end{cases}$$ Would you like more details on any step? Here are some related questions for deeper exploration: 1. How would the inequalities change if the shaded region were in a different quadrant? 2. Can we express the inequalities using only one variable? 3. What would happen to the inequalities if the line slopes changed? 4. How could you find the area of the region $$R$$? 5. How can these inequalities be graphed in a coordinate plane? **Tip**: Always double-check the orientation of the inequality signs to ensure they match the region's boundaries in the graph.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Coordinate Geometry
Linear Inequalities

Formulas

Point-slope form of a line: y - y1 = m(x - x1)
Slope formula: m = (y2 - y1) / (x2 - x1)

Theorems

Linear inequality representation in two variables

Suitable Grade Level

Grades 9-11