Math Problem Statement

-3x+4y=-14, 5x-3y=5

Solution

To solve the system of equations:

3x+4y=14-3x + 4y = -14 5x3y=55x - 3y = 5

We can use either the substitution method or the elimination method. Here, let's use the elimination method.

Step 1: Multiply the equations to align the coefficients of one variable

We want to eliminate one of the variables by making their coefficients the same. Let’s eliminate yy.

To do that, we can multiply the first equation by 3 and the second equation by 4, so that the yy-terms in both equations will have the same coefficient:

3(3x+4y)=3(14)9x+12y=423(-3x + 4y) = 3(-14) \quad \Rightarrow \quad -9x + 12y = -42 4(5x3y)=4(5)20x12y=204(5x - 3y) = 4(5) \quad \Rightarrow \quad 20x - 12y = 20

Step 2: Add the equations to eliminate yy

Now, we add the two modified equations:

(9x+12y)+(20x12y)=42+20(-9x + 12y) + (20x - 12y) = -42 + 20 11x=2211x = -22

Step 3: Solve for xx

Now, solve for xx:

x=2211=2x = \frac{-22}{11} = -2

Step 4: Substitute x=2x = -2 into one of the original equations

Now, substitute x=2x = -2 into either of the original equations. Let’s use the first equation:

3(2)+4y=14-3(-2) + 4y = -14 6+4y=146 + 4y = -14 4y=1464y = -14 - 6 4y=204y = -20 y=204=5y = \frac{-20}{4} = -5

Final Answer:

The solution to the system of equations is: x=2,y=5x = -2, \quad y = -5


Would you like any further details or clarifications on the steps?

Here are some related questions you may find useful:

  1. How would you solve the system of equations using the substitution method?
  2. What does the elimination method represent geometrically when solving linear equations?
  3. How do you check the solution of a system of equations?
  4. What is the meaning of a system of linear equations having no solution or infinitely many solutions?
  5. How do you solve systems of equations involving three variables?

Tip: When using the elimination method, always try to align the coefficients of one variable so that you can eliminate it easily!

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Math Problem Analysis

Mathematical Concepts

Algebra
Systems of Linear Equations
Elimination Method

Formulas

Elimination method: Multiply equations to align coefficients and eliminate variables

Theorems

System of linear equations has a unique solution if the equations are consistent and independent

Suitable Grade Level

Grades 9-11