Math Problem Statement

Solve the system of equations: 3x - y = 7, 2x + y = 3

Solution

We are tasked with solving the system of equations shown in the image:

3xy=7(Equation 1)3x - y = 7 \quad \text{(Equation 1)} 2x+y=3(Equation 2)2x + y = 3 \quad \text{(Equation 2)}

Step 1: Add the equations

We can eliminate yy by adding both equations together:

(3xy)+(2x+y)=7+3(3x - y) + (2x + y) = 7 + 3 This simplifies to: 5x=105x = 10

Step 2: Solve for xx

x=105=2x = \frac{10}{5} = 2

Step 3: Substitute x=2x = 2 into one of the original equations

Let's substitute it into Equation 1: 3(2)y=73(2) - y = 7 6y=76 - y = 7 y=1y=1-y = 1 \quad \Rightarrow \quad y = -1

Solution:

The solution to the system is (x,y)=(2,1)(x, y) = (2, -1).

Thus, the correct answer is (2, -1).

Would you like more details on any part of the process?

Here are some related questions you might find helpful:

  1. What are some methods to solve a system of equations?
  2. How does the substitution method differ from elimination?
  3. Can all systems of linear equations be solved by elimination?
  4. What are some cases where a system of equations has no solution?
  5. How can you graphically represent the solution to this system?

Tip: When solving systems of equations, the elimination method is often quicker when the coefficients of one variable are already opposites, like in this example!

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Math Problem Analysis

Mathematical Concepts

Algebra
System of Linear Equations

Formulas

3x - y = 7
2x + y = 3

Theorems

Elimination method for solving systems of equations

Suitable Grade Level

Grades 8-10