Math Problem Statement

Use elimination to solve the system. What is the value of x? 2x + 3y = 13 -2x + y = -1

Solution

To solve the system of equations using elimination, we have the following system:

2x+3y=13(1)2x + 3y = 13 \quad \text{(1)} 2x+y=1(2)-2x + y = -1 \quad \text{(2)}

Step 1: Add the equations

To eliminate xx, we add both equations (1) and (2):

(2x+3y)+(2x+y)=13+(1)(2x + 3y) + (-2x + y) = 13 + (-1) 0x+(3y+y)=120x + (3y + y) = 12 4y=124y = 12

Step 2: Solve for yy

y=124=3y = \frac{12}{4} = 3

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

Let's substitute y=3y = 3 into equation (2):

2x+3=1-2x + 3 = -1

Step 4: Solve for xx

2x=13-2x = -1 - 3 2x=4-2x = -4 x=42=2x = \frac{-4}{-2} = 2

Thus, the value of xx is 2.

Would you like further details or explanations on any steps?

Here are five related questions to expand your understanding:

  1. What happens if we use substitution instead of elimination?
  2. Can you verify the solution by plugging x=2x = 2 and y=3y = 3 back into both equations?
  3. How does elimination differ from substitution in terms of strategy?
  4. What would happen if the system had no solution or infinitely many solutions?
  5. How can you graphically interpret the solution of this system?

Tip: When using elimination, always check if you can cancel out one variable by adding or subtracting the equations!

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Systems of Equations
Elimination Method

Formulas

Elimination method: Adding or subtracting equations to eliminate a variable

Theorems

Linear Equation Solution Theorem

Suitable Grade Level

Grades 8-10