Math Problem Statement

Solve the system of equations: 3x - 2y = 2 and 5x - 5y = 10.

Solution

The system of equations in the image is:

3x2y=23x - 2y = 2 5x5y=105x - 5y = 10

We can solve this system using either substitution or elimination. I'll use the elimination method to find the solution.

Step 1: Multiply equations if needed to align coefficients

We want to eliminate one variable. Let's eliminate xx by multiplying the first equation by 5 and the second equation by 3, so that the coefficients of xx become the same.

5(3x2y)=5(2)15x10y=105(3x - 2y) = 5(2) \quad \Rightarrow \quad 15x - 10y = 10 3(5x5y)=3(10)15x15y=303(5x - 5y) = 3(10) \quad \Rightarrow \quad 15x - 15y = 30

Step 2: Subtract the equations

Now subtract the second equation from the first to eliminate xx:

(15x10y)(15x15y)=1030(15x - 10y) - (15x - 15y) = 10 - 30 15x10y15x+15y=2015x - 10y - 15x + 15y = -20 5y=205y = -20

Step 3: Solve for yy

y=205=4y = \frac{-20}{5} = -4

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

Let's substitute y=4y = -4 into the first equation:

3x2(4)=23x - 2(-4) = 2 3x+8=23x + 8 = 2 3x=283x = 2 - 8 3x=63x = -6 x=63=2x = \frac{-6}{3} = -2

Final Solution:

The solution to the system is: x=2,y=4x = -2, \quad y = -4

Would you like further details or explanations on any step?

Here are 5 related questions to expand on this concept:

  1. Can you solve the same system using the substitution method?
  2. What is the graphical interpretation of this system of equations?
  3. How would the solution change if the second equation was 5x5y=125x - 5y = 12?
  4. What would happen if both equations were parallel (e.g., 3x2y=23x - 2y = 2 and 6x4y=46x - 4y = 4)?
  5. How can you tell if a system of equations has no solution or infinite solutions?

Tip: Always check your solution by plugging the values of xx and yy back into the original equations to verify that they satisfy both equations.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
System of Equations

Formulas

Elimination method for solving systems of equations

Theorems

Substitution and Elimination Methods in Algebra

Suitable Grade Level

Grades 8-10