The Given System of Linear Equations

Oct 13, 2025 by wbrum.org 120 views

Introduction

Solving a system of linear equations is a fundamental concept in mathematics, particularly in algebra and geometry. It involves finding the values of variables that satisfy multiple linear equations simultaneously. In this article, we will explore the solution to a given system of linear equations and provide a step-by-step guide on how to solve it.

What is a System of Linear Equations?

A system of linear equations is a set of two or more linear equations that involve variables. Each equation is in the form of ax + by = c, where a, b, and c are constants, and x and y are variables. The system of linear equations can be represented graphically as a set of lines on a coordinate plane.

The Given System of Linear Equations

The given system of linear equations is:

${ \begin{array}{l} 7x - 2y = -6 \\ 8x + y = 3 \end{array} }$

Step 1: Write Down the Given Equations

The first step in solving the system of linear equations is to write down the given equations.

${ \begin{array}{l} 7x - 2y = -6 \\ 8x + y = 3 \end{array} }$

Step 2: Solve One Equation for One Variable

To solve the system of linear equations, we can use the method of substitution or elimination. In this case, we will use the elimination method. We will solve one equation for one variable and then substitute that expression into the other equation.

Let's solve the second equation for y:

${ 8x + y = 3 }$

Subtracting 8x from both sides gives:

${ y = -8x + 3 }$

Step 3: Substitute the Expression into the Other Equation

Now that we have an expression for y, we can substitute it into the first equation:

${ 7x - 2y = -6 }$

Substituting y = -8x + 3 into the first equation gives:

${ 7x - 2(-8x + 3) = -6 }$

Expanding and simplifying the equation gives:

${ 7x + 16x - 6 = -6 }$

Combine like terms:

${ 23x - 6 = -6 }$

Adding 6 to both sides gives:

${ 23x = 0 }$

Dividing both sides by 23 gives:

${ x = 0 }$

Step 4: Find the Value of y

Now that we have the value of x, we can find the value of y by substituting x into one of the original equations. Let's use the second equation:

${ 8x + y = 3 }$

Substituting x = 0 into the equation gives:

${ 8(0) + y = 3 }$

Simplifying the equation gives:

${ y = 3 }$

Step 5: Write Down the Solution

The solution to the system of linear equations is:

${ (x, y) = (0, 3) }$

Conclusion

In this article, we have solved a system of linear equations using the elimination method. We have shown that the solution to the system is (0, 3). This solution satisfies both equations in the system.

Discussion

The solution to the system of linear equations is (0, 3). This means that when x = 0 and y = 3, both equations in the system are satisfied.

Final Answer

The final answer is:

${ (0, 3) }$

This is the solution to the system of linear equations.

Comparison with Other Options

Let's compare the solution we found with the other options:

A. ${ (-6, 3) }$

B. ${ (0, 3) }$

C. ${ (1, -5) }$

D. ${ (15, -1) }$

The solution we found, (0, 3), matches option B.

Conclusion

In conclusion, the solution to the system of linear equations is (0, 3). This solution satisfies both equations in the system. We have shown that the elimination method can be used to solve systems of linear equations.

Introduction

Solving systems of linear equations is a fundamental concept in mathematics, particularly in algebra and geometry. In this article, we will answer some frequently asked questions (FAQs) about solving systems of linear equations.

Q: What is a system of linear equations?

A: A system of linear equations is a set of two or more linear equations that involve variables. Each equation is in the form of ax + by = c, where a, b, and c are constants, and x and y are variables.

Q: How do I solve a system of linear equations?

A: There are several methods to solve a system of linear equations, including the substitution method, elimination method, and graphing method. The most common method is the elimination method, which involves adding or subtracting the equations to eliminate one of the variables.

Q: What is the elimination method?

A: The elimination method is a method of solving systems of linear equations by adding or subtracting the equations to eliminate one of the variables. This method involves multiplying one or both of the equations by a constant to make the coefficients of one of the variables the same, and then adding or subtracting the equations to eliminate that variable.

Q: How do I use the elimination method to solve a system of linear equations?

A: To use the elimination method, follow these steps:

Multiply one or both of the equations by a constant to make the coefficients of one of the variables the same.
Add or subtract the equations to eliminate that variable.
Solve for the remaining variable.
Substitute the value of the remaining variable into one of the original equations to solve for the other variable.

Q: What is the substitution method?

A: The substitution method is a method of solving systems of linear equations by substituting the expression for one variable from one equation into the other equation. This method involves solving one equation for one variable and then substituting that expression into the other equation.

Q: How do I use the substitution method to solve a system of linear equations?

A: To use the substitution method, follow these steps:

Solve one equation for one variable.
Substitute that expression into the other equation.
Solve for the remaining variable.
Substitute the value of the remaining variable into one of the original equations to solve for the other variable.

Q: What is the graphing method?

A: The graphing method is a method of solving systems of linear equations by graphing the equations on a coordinate plane and finding the point of intersection. This method involves graphing the equations on a coordinate plane and finding the point where the two lines intersect.

Q: How do I use the graphing method to solve a system of linear equations?

A: To use the graphing method, follow these steps:

Graph the equations on a coordinate plane.
Find the point of intersection.
The point of intersection is the solution to the system of linear equations.

Q: What are some common mistakes to avoid when solving systems of linear equations?

A: Some common mistakes to avoid when solving systems of linear equations include:

Not following the order of operations
Not simplifying the equations
Not checking the solution
Not using the correct method for the type of system

Q: How do I check my solution?

A: To check your solution, substitute the values of the variables into both equations and make sure that both equations are satisfied.

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

A: Solving systems of linear equations has many real-world applications, including:

Finding the intersection of two lines
Determining the cost of producing a product
Finding the maximum or minimum value of a function
Solving problems in physics, engineering, and economics

Conclusion

In conclusion, solving systems of linear equations is a fundamental concept in mathematics, and there are several methods to solve them, including the substitution method, elimination method, and graphing method. By following the steps outlined in this article, you can solve systems of linear equations and apply them to real-world problems.