Finding the Number of Children

Oct 13, 2025 by wbrum.org 8 views

Introduction

In mathematics, linear equations are a fundamental concept that can be applied to various real-world scenarios. One of the most common forms of linear equations is the standard form, which is represented as ${$ (Ax + By = C)$}$. In this article, we will explore the standard form applications of linear equations using a real-world example.

The Problem

Let's consider a scenario where the admission fee at a small fair is ${$ $1.50$}$ for children and ${$ $4.00$}$ for adults. On a certain day, ${$ $5,050$}$ is collected. If 1,000 adults attended the fair, how many children attended?

Setting Up the Equation

To solve this problem, we need to set up a linear equation using the given information. Let's assume the number of children who attended the fair is ${$ x$}$ and the number of adults who attended is ${$ y$}$. We know that the total amount collected is ${$ $5,050$}$, and the admission fee for children is ${$ $1.50$}$ and for adults is ${$ $4.00$}$.

We can set up the equation as follows:

${$ $1.50x + $4.00y = $5,050$}$

Solving the Equation

To solve this equation, we need to isolate one of the variables. Let's isolate ${$ x$}$ by subtracting ${$ $4.00y$}$ from both sides of the equation:

${$ $1.50x = $5,050 - $4.00y$}$

Now, we can divide both sides of the equation by ${$ $1.50$}$ to solve for ${$ x$}$:

${$ x = ($5,050 - $4.00y) / $1.50$}$

Finding the Number of Children

We know that 1,000 adults attended the fair, so we can substitute ${$ y = 1,000$}$ into the equation:

${$ x = ($5,050 - $4.00(1,000)) / $1.50$}$

Simplifying the equation, we get:

${$ x = ($5,050 - $4,000) / $1.50$}$

${$ x = $1,050 / $1.50$}$

${$ x = 700$}$

Therefore, 700 children attended the fair.

Conclusion

In this article, we explored the standard form applications of linear equations using a real-world example. We set up a linear equation using the given information and solved for the number of children who attended the fair. This example demonstrates how linear equations can be applied to various real-world scenarios and how they can be used to solve problems.

Real-World Applications

Linear equations have numerous real-world applications, including:

Finance: Linear equations can be used to calculate interest rates, investment returns, and other financial metrics.
Science: Linear equations can be used to model population growth, chemical reactions, and other scientific phenomena.
Engineering: Linear equations can be used to design and optimize systems, such as bridges, buildings, and electronic circuits.
Business: Linear equations can be used to optimize production, inventory, and supply chain management.

Tips and Tricks

When working with linear equations, it's essential to:

Read the problem carefully: Make sure you understand the problem and the given information.
Set up the equation correctly: Use the given information to set up the equation.
Solve the equation systematically: Use algebraic techniques to solve the equation.
Check your answer: Verify that your answer makes sense in the context of the problem.

Conclusion

Introduction

In our previous article, we explored the standard form applications of linear equations using a real-world example. In this article, we will answer some frequently asked questions about linear equations and provide additional insights into their applications.

Q: What is the standard form of a linear equation?

A: The standard form of a linear equation is represented as ${$ (Ax + By = C)$}$, where ${$ A$}$, ${$ B$}$, and ${$ C$}$ are constants, and ${$ x$}$ and ${$ y$}$ are variables.

Q: How do I set up a linear equation?

A: To set up a linear equation, you need to identify the variables and the constants in the problem. Then, you can use the given information to set up the equation. For example, if the admission fee at a fair is ${$ $1.50$}$ for children and ${$ $4.00$}$ for adults, and ${$ $5,050$}$ is collected, you can set up the equation as follows:

${$ $1.50x + $4.00y = $5,050$}$

Q: How do I solve a linear equation?

A: To solve a linear equation, you need to isolate one of the variables. You can do this by adding, subtracting, multiplying, or dividing both sides of the equation by the same value. For example, to solve the equation ${$ $1.50x + $4.00y = $5,050$}$, you can subtract ${$ $4.00y$}$ from both sides of the equation:

${$ $1.50x = $5,050 - $4.00y$}$

Then, you can divide both sides of the equation by ${$ $1.50$}$ to solve for ${$ x$}$:

${$ x = ($5,050 - $4.00y) / $1.50$}$

Q: What are some real-world applications of linear equations?

A: Linear equations have numerous real-world applications, including:

Finance: Linear equations can be used to calculate interest rates, investment returns, and other financial metrics.
Science: Linear equations can be used to model population growth, chemical reactions, and other scientific phenomena.
Engineering: Linear equations can be used to design and optimize systems, such as bridges, buildings, and electronic circuits.
Business: Linear equations can be used to optimize production, inventory, and supply chain management.

Q: How do I check my answer?

A: To check your answer, you need to verify that it makes sense in the context of the problem. You can do this by plugging your answer back into the original equation and checking if it is true. For example, if you solve the equation ${$ $1.50x + $4.00y = $5,050$}$ and get ${$ x = 700$}$, you can plug ${$ x = 700$}$ back into the equation to check if it is true:

${$ $1.50(700) + $4.00y = $5,050$}$

Simplifying the equation, you get:

${$ $1,050 + $4.00y = $5,050$}$

Subtracting ${$ $1,050$}$ from both sides of the equation, you get:

${$ $4.00y = $4,000$}$

Dividing both sides of the equation by ${$ $4.00$}$, you get:

${$ y = 1,000$}$

Therefore, your answer is correct.

Q: What are some common mistakes to avoid when working with linear equations?

A: Some common mistakes to avoid when working with linear equations include:

Not reading the problem carefully: Make sure you understand the problem and the given information.
Not setting up the equation correctly: Use the given information to set up the equation.
Not solving the equation systematically: Use algebraic techniques to solve the equation.
Not checking your answer: Verify that your answer makes sense in the context of the problem.

Conclusion

In conclusion, linear equations are a fundamental concept in mathematics that can be applied to various real-world scenarios. By understanding and applying linear equations, we can gain insights into the world around us and make informed decisions. We hope this Q&A article has provided you with a better understanding of linear equations and their applications.