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Sketch a graph showing the solution to each system. a. \(y \leq 2\) b. \(x+y \leq 4\) \(x<2\) \(x-y \leq 4\)

Short Answer

Expert verified
The solution is the region of overlap of all the shaded areas on the graph, meeting the conditions of each inequality.

Step by step solution

01

Understand the Inequalities

We are given four inequalities to represent graphically: 1. \( y \leq 2 \)2. \( x+y \leq 4 \)3. \( x < 2 \)4. \( x-y \leq 4 \)These inequalities will form the boundaries and shaded regions on a coordinate plane.
02

Graph the Boundary of the Inequality y ≤ 2

Draw the horizontal line \( y = 2 \). This line will be solid because the inequality includes equality (≤). Shade all the area below this line to represent \( y \leq 2 \).
03

Graph the Boundary of the Inequality x + y ≤ 4

Draw the line \( x + y = 4 \). This line will be solid for the same reason as above. Rearrange to get \( y = -x + 4 \) and draw the line using the y-intercept 4 and another point like point (0,4) and (4,0). Shade below this line to represent \( x + y \leq 4 \).
04

Graph the Boundary of the Inequality x < 2

Draw a vertical dashed line at \( x = 2 \) because the inequality is strict (<). This means points on the line \( x = 2 \) are not included in the solution. Shade the area to the left of this line to represent \( x < 2 \).
05

Graph the Boundary of the Inequality x - y ≤ 4

Write the inequality as \( y \geq x - 4 \) and draw the line \( x - y = 4 \) as a solid line. Rearrange to get \( y = x - 4 \) and use points such as (4,0) and (0,-4) for the graph. Shade above this line representing the inequality \( x - y \leq 4 \).
06

Find and Shade the Solution Region

The solution is the region on the graph where all shaded areas overlap for all inequalities. Verify which sections are included based on the conditions \( y \leq 2 \), \( x+y \leq 4 \), \( x < 2 \), and \( x-y \leq 4 \). This overlapped region represents the combined solution.

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Key Concepts

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

Systems of Inequalities
Systems of inequalities are collections of two or more inequalities that share the same variables. In contrast to solving equations, where you look for specific values, you estimate ranges or regions where solutions exist. When dealing with systems of inequalities, the solution is typically a region or an area on a graph where all inequalities are satisfied simultaneously.

Each inequality divides the coordinate plane into two parts - one where the inequality is true and one where it isn't. To find the solution region, you need to identify all the areas where these inequalities overlap, meaning each point within the region satisfies every inequality in the system.

To solve a system like the one given, it's crucial to graph each inequality properly and determine where they intersect and thus represent possible solutions. Understanding systems of inequalities helps in visualizing solutions to real-world problems, where you often have multiple restrictions at once.
Coordinate Plane
The coordinate plane is a two-dimensional surface used to graph points, lines, and curves based on pairs of numeric coordinates. It consists of two axes: the horizontal axis (x-axis) and the vertical axis (y-axis). The point where these axes intersect is called the origin, marked as (0,0).

In the context of graphing inequalities, the coordinate plane allows us to visualize which regions satisfy each inequality. For example, lines drawn accordingly show boundaries between different regions we need to consider in finding solutions. Each inequality equates to drawing a line or a curve that divides the plane into two parts — one part where the inequality holds true and another where it does not.

Properly using the coordinate plane involves plotting boundaries, checking whether points satisfy multiple constraints, and then focusing on overlapping areas. This helps translate the abstract concepts of inequalities into a visual solution.
Solution Region
The solution region refers to the area on the coordinate plane where all inequalities in a system are true simultaneously. It is the overlapping section that lies within the bounds of each inequality's graph.

To identify it, after graphing the boundaries for each inequality, you look for the zone where all shaded regions meet. The solution region is typically bounded by solid, dashed, or multi-colored lines corresponding to the inequalities.

In systems with inequalities such as the given exercise, the goal is to determine the precise section where all the conditions (e.g., \(y \leq 2\), \(x+y \leq 4\), etc.) overlap. Thus, the solution region provides a visual and practical way to see all the possible solutions or ranges for a set of conditions.
Shading Regions
Shading is crucial in solving graphical systems of inequalities. It helps visually represent the solutions by marking areas where each inequality is valid.

Each inequality drawn on the coordinate plane will involve shading a specific portion based on whether it uses a solid line (for ≤ or ≥) or a dashed line (for < or >). Solid lines mean points on the line are included in the solution, while dashed lines mean they are not.

For example, in the inequality \( y \leq 2 \), you draw a solid line at \( y = 2 \) and shade below the line. With \( x < 2 \), place a dashed line and shade to the left of the line. These shaded areas visually display which zones fulfill each inequality condition. When shading for multiple inequalities, ensure careful attention to the overlap, which indicates the valid solution region.

Effective shading simplifies understanding and interpretation of solutions, ensuring the right areas are identified without confusion.

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Most popular questions from this chapter

Solve each inequality and show your work. a. \(4.1+3.2 x>18\) (a) b. \(7.2-2.1 b<4.4\) c. \(7-2(x-3) \geq 25\) d. \(11.5+4.5(x+1.8) \leq x\)

Use row operations to transform $$ \left[\begin{array}{rrc} 4.2 & 0 & 12.6 \\ 0 & -1 & 5.25 \end{array}\right] $$ $$ \text { into the form }\left[\begin{array}{lll} 1 & 0 & a \\ 0 & 1 & b \end{array}\right] \text {. } $$

Solve the system of equations using the substitution method, and check your solution. (hi) $$ \left\\{\begin{array}{l} y=25+30 x \\ y=15+32 x \end{array}\right. $$

The American College of Sports Medicine considers age as one factor when it recommends low and high heart rates during workout sessions. For safe and efficient training, your heart rate should be between \(55 \%\) and \(90 \%\) of the maximum heart rate level. The maximum heart rate is calculated by subtracting a person's age from 220 beats per minute. a. Define variables and write an equation relating age and maximum heart rate during workouts. b. Write a system of inequalities to represent the recommended high and low heart rates during a workout. (A) c. Graph the solution to show a region of safe and efficient heart rates for people of any age. d. What constraints should you add to limit your region to show the safe and efficient heart rates for people between the ages of 14 and 40 ? (a) e. Graph the new solution for \(8 \mathrm{~d}\).

Consider the inequality \(3 x-2 y \leq 6\). a. Solve the equation \(3 x-2 y=6\) for \(y\) and graph the equation. b. Test the points \((1,3)\) and \((1,-3)\). Which point makes the statement true? Does this indicate that you should shade above or below the line \(3 x-2 y=6\) ? c. You might think that the inequality \(3 x-2 y \leq 6\) indicates that you should shade below the boundary line. Make a conjecture about when you must shade the side that is opposite what the inequality symbol implies.

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