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Sketch the region that corresponds to the given inequalities, say whether the region is bounded or unbounded, and find the coordinates of all corner points (if any). $$ \begin{aligned} x+y & \geq 5 \\ x \quad & \leq 10 \\ y & \leq 8 \\ x \geq 0 &, y \geq 0 \end{aligned} $$

Short Answer

Expert verified
The region that corresponds to the system of inequalities can be found by graphing each inequality on the coordinate plane, and shading the region where they all overlap. After doing so, we find that the region is bounded and forms an enclosed polygon. There is only one corner point, which is at the intersection of \(x = 10\) and \(y = 8\). Thus, the corner point is (10, 8).

Step by step solution

01

Graph Each Inequality

First, we'll rewrite each inequality as an equation to graph them more easily: 1. \(x+y = 5\) 2. \(x = 10\) 3. \(y = 8\) 4. \(x = 0\) 5. \(y = 0\) To graph these inequalities, we can plot all points for which the inequalities are satisfied.
02

Identify the Region that Satisfies All Inequalities

Next, we will shade the region that corresponds to the inequalities as follows: 1. \(x+y \geq 5\) - Shade the region above and including the line \(x+y = 5\) 2. \(x \leq 10\) - Shade the region to the left and including the line \(x = 10\) 3. \(y \leq 8\) - Shade the region below and including the line \(y = 8\) 4. \(x \geq 0\) - Shade the region to the right and including the line \(x = 0\) 5. \(y \geq 0\) - Shade the region above and including the line \(y = 0\) By shading these regions, we will find the region that fulfills all inequalities.
03

Determine if the Region is Bounded or Unbounded

The region of interest is where all shading overlaps. We can see that this creates an enclosed polygon, so we can conclude that the region is bounded.
04

Find the Corner Points

Now, we need to find the coordinates of the corner points where the lines intersect. We'll need to solve the system of equations for each intersection point. There are four possible corner points as follows: 1. Intersection of \(x+y = 5\), \(x = 0\), and \(y = 0\): Since this intersection doesn't exist, there's no corner point here. 2. Intersection of \(x+y = 5\) and \(x = 10\): \( \begin{aligned} x+y &= 5 \\\ x &= 10 \end{aligned} \) Solving this system of equations, we get \(x = 10\) and \(y = -5\). Since \(y \geq 0\), there is no corner point. 3. Intersection of \(x = 10\), \(y = 8\), and \(x+y = 5\): There is no intersection point for all three lines, so there is no corner point here. 4. Intersection of \(x = 10\), \(y = 8\), \(x = 0\), and \(y = 0\): Here, we only have intersections between \(x=10\) and \(y=8\), which is the point (10, 8). This is a corner point. Therefore, there is only one corner point which is (10, 8).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Graphing Inequalities
Graphing linear inequalities involves plotting lines and determining the area they delineate on a coordinate plane. Each inequality in the problem, such as those given in the exercise, represents a half-plane that is either above or below, to the right or left of a line, or even enclosed in quadrants. Here is how to approach graphing inequalities:

  • First, treat each inequality as though it were an equation. This allows you to graph the line by finding the x-intercept and y-intercept, making it simpler to draw. For example, the line derived from the inequality \(x + y \geq 5\) is \(x + y = 5\).
  • Next, use a solid line for inequalities that have \(\leq\) or \(\geq\), indicating that points on the line satisfy the inequality. Use a dashed line for \(<\) or \(>\) inequalities.
  • Finally, shade the area of the coordinate plane that satisfies the inequality. For an inequality \(y \leq 8\), you would shade the area below the line \(y = 8\).
Pay special attention to where the shaded areas of different inequalities overlap. This overlap is significant because it represents all possible solutions.
Bounded and Unbounded Regions
In coordinate geometry, a region can be bounded or unbounded by the constraints imposed by inequalities. Understanding the difference between these two types of regions is essential for correctly interpreting results.

  • A **bounded region** is an area that is contained within a certain section of the coordinate plane, typically forming an enclosed shape, such as a polygon. This happens when all inequalities combine to create boundaries that surround an area entirely. In the given exercise, the region delineated by the inequalities is enclosed, forming a polygon, and is thus bounded.
  • An **unbounded region** is where the area continues indefinitely, usually in one or more directions. This occurs if the inequalities define boundaries that do not enclose an entire region.
Determining whether a region is bounded or unbounded can help further understand and visualize the solution set of a system of inequalities.
Intersection Points
Intersection points hold critical importance in the context of inequality regions. These points are where lines meet and are highly relevant as they often form the corners of the bounded region.

To find intersection points, solve a system of equations given by the lines derived from the inequalities:
  • For example, the exercise requires finding where lines intersect, such as \(x = 10\) and \(y = 8\). The solution is straightforward since these two lines intersect at the point (10, 8).
  • Checking if an intersection satisfies all the original inequalities is crucial. In cases where \(y\) from the intersection is negative, yet \(y \geq 0\) is an original condition, such as in several intersection setups of the exercise, those points are invalid.
This approach will help ascertain all viable corner points of a bounded region.
Coordinate Geometry
Coordinate geometry forms the mathematical backbone of the concepts discussed in this exercise. It provides the tools to take abstract algebraic concepts like inequalities and make them visual and interpretable on a coordinate plane.

  • Understanding how to navigate the coordinate plane with given lines \(x = 10\), \(y = 8\), and so on, means knowing precisely where these lines divide the plane.
  • The process starts by plotting these lines based on known points, such as intercepts. Then, observing these lines and their respective inequalities helps map out the solution area.
  • The intersection of these lines, their placement relative to the axes, and the regions they define are core to evaluating solutions and successfully graphing inequalities.
Mastering coordinate geometry allows a student to move beyond basic calculations to a deeper understanding of how these calculations manifest on the plane.

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