Math Problem Statement

Solve the system of equations using elimination: 2x - 2y = -6 and 5x - 2y = 3.

Solution

Let's solve the system of equations using the elimination method.

Given system:

  1. 2x2y=62x - 2y = -6
  2. 5x2y=35x - 2y = 3

Step 1: Subtract the two equations

Since both equations have 2y-2y, we subtract the first equation from the second:

(5x2y)(2x2y)=3(6)(5x - 2y) - (2x - 2y) = 3 - (-6)

5x2y2x+2y=3+65x - 2y - 2x + 2y = 3 + 6

(5x2x)+(2y+2y)=9(5x - 2x) + (-2y + 2y) = 9

3x=93x = 9

Step 2: Solve for xx

x=93=3x = \frac{9}{3} = 3

Step 3: Substitute x=3x = 3 into one of the original equations

Using 2x2y=62x - 2y = -6:

2(3)2y=62(3) - 2y = -6

62y=66 - 2y = -6

2y=12-2y = -12

y=122=6y = \frac{-12}{-2} = 6

Solution:

(x,y)=(3,6)(x, y) = (3,6)

Would you like a detailed explanation of any step?

Related Questions:

  1. How does the elimination method work in general?
  2. What would happen if the coefficients of yy were different?
  3. Can this system be solved using the substitution method?
  4. How can you check if the solution is correct?
  5. What does it mean if elimination results in an identity like 0=00 = 0 or a contradiction like 0=50 = 5?

Tip:

Always double-check your solution by plugging the values back into the original equations!

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Math Problem Analysis

Mathematical Concepts

Algebra
Systems of Linear Equations
Elimination Method

Formulas

Linear equation: ax + by = c

Theorems

Properties of Equality
System of Linear Equations Solution Methods

Suitable Grade Level

Grades 8-10