Finding the Region that Satisfies the Inequality

Oct 13, 2025 by windailys.com 104 views

Introduction

In this article, we will delve into a mathematical problem that involves a real-life scenario. Eula needs to purchase binders and notebooks, but she has a limited budget of $20. The cost of each binder is $4, and the cost of each notebook is $2. We will use the graph of the inequality 4x + 2y ≤ 20 to represent the situation and find the maximum number of binders and notebooks Eula can buy within her budget.

The Inequality: A Mathematical Representation

The inequality 4x + 2y ≤ 20 represents the situation where Eula's total expenditure on binders and notebooks does not exceed $20. Here, x represents the number of binders and y represents the number of notebooks. The coefficient of x is 4, which means that each binder costs $4, and the coefficient of y is 2, which means that each notebook costs $2.

Graphing the Inequality

To graph the inequality, we need to find the boundary line and the region that satisfies the inequality. The boundary line is given by the equation 4x + 2y = 20. We can graph this line by finding two points that satisfy the equation and drawing a line through them.

Finding the Boundary Line

To find the boundary line, we need to find two points that satisfy the equation 4x + 2y = 20. We can do this by substituting different values of x and y into the equation and solving for the other variable.

Let's find the point where x = 0. Substituting x = 0 into the equation, we get:

4(0) + 2y = 20

Simplifying the equation, we get:

2y = 20

Dividing both sides by 2, we get:

y = 10

So, the point (0, 10) satisfies the equation.

Now, let's find the point where y = 0. Substituting y = 0 into the equation, we get:

4x + 2(0) = 20

Simplifying the equation, we get:

4x = 20

Dividing both sides by 4, we get:

x = 5

So, the point (5, 0) satisfies the equation.

Drawing the Boundary Line

Now that we have two points that satisfy the equation, we can draw the boundary line. The boundary line is a line that passes through the points (0, 10) and (5, 0).

Finding the Region that Satisfies the Inequality

The region that satisfies the inequality is the region below the boundary line. This is because the inequality is of the form 4x + 2y ≤ 20, which means that the total expenditure on binders and notebooks does not exceed $20.

Interpreting the Graph

The graph of the inequality 4x + 2y ≤ 20 represents the situation where Eula's total expenditure on binders and notebooks does not exceed $20. The region below the boundary line represents the possible combinations of binders and notebooks that Eula can buy within her budget.

Finding the Maximum Number of Binders and Notebooks

To find the maximum number of binders and notebooks that Eula can buy within her budget, we need to find the point on the boundary line that is closest to the origin. This point represents the maximum number of binders and notebooks that Eula can buy.

Let's find the point on the boundary line that is closest to the origin. We can do this by finding the intersection of the boundary line and the x-axis.

The boundary line is given by the equation 4x + 2y = 20. We can find the intersection of the boundary line and the x-axis by substituting y = 0 into the equation.

Substituting y = 0 into the equation, we get:

4x + 2(0) = 20

Simplifying the equation, we get:

4x = 20

Dividing both sides by 4, we get:

x = 5

So, the point (5, 0) is the intersection of the boundary line and the x-axis.

Conclusion

In this article, we used the graph of the inequality 4x + 2y ≤ 20 to represent the situation where Eula's total expenditure on binders and notebooks does not exceed $20. We found the maximum number of binders and notebooks that Eula can buy within her budget by finding the point on the boundary line that is closest to the origin.

Final Answer

The maximum number of binders that Eula can buy is 5, and the maximum number of notebooks that Eula can buy is 0.

Additional Information

The graph of the inequality 4x + 2y ≤ 20 can be used to represent other real-life scenarios where there are constraints on the total expenditure. For example, if Eula has a budget of $30, we can graph the inequality 4x + 2y ≤ 30 to find the maximum number of binders and notebooks that Eula can buy within her budget.

References

[1] Graphing Inequalities. Khan Academy.
[2] Systems of Linear Equations. Mathway.
[3] Graphing Linear Inequalities. Purplemath.
Eula's Shopping Dilemma: A Q&A Guide =====================================

Introduction

In our previous article, we explored the problem of Eula's shopping dilemma, where she needs to buy binders and notebooks within a limited budget of $20. We used the graph of the inequality 4x + 2y ≤ 20 to represent the situation and found the maximum number of binders and notebooks that Eula can buy within her budget. In this article, we will answer some frequently asked questions related to Eula's shopping dilemma.

Q&A

Q: What is the maximum number of binders that Eula can buy?

A: The maximum number of binders that Eula can buy is 5.

Q: What is the maximum number of notebooks that Eula can buy?

A: The maximum number of notebooks that Eula can buy is 0.

Q: What is the total expenditure on binders and notebooks if Eula buys 5 binders and 0 notebooks?

A: The total expenditure on binders and notebooks if Eula buys 5 binders and 0 notebooks is $20.

Q: What is the total expenditure on binders and notebooks if Eula buys 0 binders and 10 notebooks?

A: The total expenditure on binders and notebooks if Eula buys 0 binders and 10 notebooks is $20.

Q: Can Eula buy more notebooks if she has a budget of $30?

A: Yes, Eula can buy more notebooks if she has a budget of $30. The graph of the inequality 4x + 2y ≤ 30 will give us the maximum number of notebooks that Eula can buy within her budget.

Q: How can we represent the situation where Eula's total expenditure on binders and notebooks does not exceed $30?

A: We can represent the situation where Eula's total expenditure on binders and notebooks does not exceed $30 by graphing the inequality 4x + 2y ≤ 30.

Q: What is the intersection of the boundary line and the x-axis?

A: The intersection of the boundary line and the x-axis is the point (5, 0).

Q: What is the intersection of the boundary line and the y-axis?

A: The intersection of the boundary line and the y-axis is the point (0, 10).

Q: Can we use the graph of the inequality 4x + 2y ≤ 20 to represent other real-life scenarios?

A: Yes, we can use the graph of the inequality 4x + 2y ≤ 20 to represent other real-life scenarios where there are constraints on the total expenditure.

Q: How can we find the maximum number of binders and notebooks that Eula can buy within her budget?

A: We can find the maximum number of binders and notebooks that Eula can buy within her budget by finding the point on the boundary line that is closest to the origin.

Conclusion

In this article, we answered some frequently asked questions related to Eula's shopping dilemma. We hope that this Q&A guide has provided you with a better understanding of the problem and its solution.

Final Answer

The maximum number of binders that Eula can buy is 5, and the maximum number of notebooks that Eula can buy is 0.

Additional Information

References

[1] Graphing Inequalities. Khan Academy.
[2] Systems of Linear Equations. Mathway.
[3] Graphing Linear Inequalities. Purplemath.