Math Problem Statement

Solve the system of linear equations: 3x + 2y = 14 and 2x + 3y = 14.

Solution

The system of linear equations in the image is:

3x+2y=143x + 2y = 14 2x+3y=142x + 3y = 14

We can solve this system using either the substitution method, the elimination method, or matrix methods. Let's proceed with the elimination method:

  1. Multiply the first equation by 3 and the second by 2 to align the coefficients of yy:

(3x+2y=14)×3    9x+6y=42(3x + 2y = 14) \times 3 \implies 9x + 6y = 42 (2x+3y=14)×2    4x+6y=28(2x + 3y = 14) \times 2 \implies 4x + 6y = 28

  1. Subtract the second equation from the first to eliminate yy:

(9x+6y)(4x+6y)=4228(9x + 6y) - (4x + 6y) = 42 - 28 5x=145x = 14

  1. Solve for xx:

x=145=2.8x = \frac{14}{5} = 2.8

  1. Substitute x=2.8x = 2.8 into one of the original equations to find yy. Using the first equation:

3(2.8)+2y=143(2.8) + 2y = 14 8.4+2y=148.4 + 2y = 14 2y=148.4=5.62y = 14 - 8.4 = 5.6 y=5.62=2.8y = \frac{5.6}{2} = 2.8

Thus, the solution is:

x=2.8,y=2.8x = 2.8, \quad y = 2.8

Would you like any further details or have any questions about this method?

Here are some related questions for further exploration:

  1. What are the advantages of using the elimination method over substitution?
  2. How would you solve the system using matrices (Cramer's rule or Gaussian elimination)?
  3. What happens if the system has no solution or an infinite number of solutions?
  4. How can graphing the system help verify the solution?
  5. Can you extend this method to solve systems with three variables?

Tip: Always check your solution by substituting the values of xx and yy back into both original equations!

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Systems of Equations

Formulas

Elimination method
Substitution method

Theorems

Linear Combination in Systems of Equations

Suitable Grade Level

Grades 8-10