Math Problem Statement

2x+3y =14 3x+2y=8

Solution

To solve the system of linear equations:

  1. 2x+3y=142x + 3y = 14
  2. 3x+2y=83x + 2y = 8

we can use either the substitution method or the elimination method. Here, I will use the elimination method to solve the system.

Step-by-Step Solution

Step 1: Align the equations

2x+3y=14(Equation 1)2x + 3y = 14 \quad \text{(Equation 1)} 3x+2y=8(Equation 2)3x + 2y = 8 \quad \text{(Equation 2)}

Step 2: Multiply the equations to align coefficients

To eliminate xx, we can multiply Equation 1 by 3 and Equation 2 by 2:

3(2x+3y)=314    6x+9y=423(2x + 3y) = 3 \cdot 14 \implies 6x + 9y = 42 2(3x+2y)=28    6x+4y=162(3x + 2y) = 2 \cdot 8 \implies 6x + 4y = 16

Now we have the system:

6x+9y=42(Equation 3)6x + 9y = 42 \quad \text{(Equation 3)} 6x+4y=16(Equation 4)6x + 4y = 16 \quad \text{(Equation 4)}

Step 3: Subtract the equations to eliminate xx

Subtract Equation 4 from Equation 3:

(6x+9y)(6x+4y)=4216(6x + 9y) - (6x + 4y) = 42 - 16 5y=265y = 26

Step 4: Solve for yy

y=265=5.2y = \frac{26}{5} = 5.2

Step 5: Substitute yy back into one of the original equations

Let's substitute y=5.2y = 5.2 into Equation 1:

2x+3(5.2)=142x + 3(5.2) = 14 2x+15.6=142x + 15.6 = 14 2x=1415.62x = 14 - 15.6 2x=1.62x = -1.6 x=1.62=0.8x = \frac{-1.6}{2} = -0.8

Solution:

x=0.8,y=5.2x = -0.8, \quad y = 5.2

So, the solution to the system of equations is:

(x,y)=(0.8,5.2)(x, y) = (-0.8, 5.2)

Would you like more details on any of these steps, or do you have any questions?

5 Related Questions:

  1. How can we verify the solution to this system of equations?
  2. What is the graphical interpretation of solving a system of linear equations?
  3. How can we solve this system using the substitution method?
  4. What are some real-world applications of solving systems of equations?
  5. How can we solve systems of equations with more than two variables?

Tip: When solving systems of equations, it's helpful to check your solution by substituting the values back into the original equations to ensure they satisfy both equations.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Systems of Equations
Elimination Method

Formulas

Elimination Method for solving systems of linear equations
Substitution method

Theorems

Basic principles of solving linear equations
Properties of equality

Suitable Grade Level

Grades 8-10