Math Problem Statement

Solve the following system of equations: 3x - 8y = 9 and -3x + 10y = -15.

Solution

The system of equations presented is as follows:

3x8y=9(Equation 1)3x - 8y = 9 \quad \text{(Equation 1)} 3x+10y=15(Equation 2)-3x + 10y = -15 \quad \text{(Equation 2)}

To solve this system, we can use either the substitution method or the elimination method. Let's proceed with the elimination method.

Step 1: Add both equations to eliminate xx

By adding the two equations, the xx-terms will cancel out:

(3x8y)+(3x+10y)=9+(15)(3x - 8y) + (-3x + 10y) = 9 + (-15) 3x8y3x+10y=63x - 8y - 3x + 10y = -6 2y=62y = -6

Step 2: Solve for yy

Now, divide both sides of the equation by 2:

y=62=3y = \frac{-6}{2} = -3

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

Let's substitute y=3y = -3 into the first equation 3x8y=93x - 8y = 9:

3x8(3)=93x - 8(-3) = 9 3x+24=93x + 24 = 9 3x=9243x = 9 - 24 3x=153x = -15

Step 4: Solve for xx

Now, divide both sides by 3:

x=153=5x = \frac{-15}{3} = -5

Final Solution:

The solution to the system of equations is: x=5,y=3x = -5, \quad y = -3

Would you like a more detailed explanation or further clarification on this process? Here are a few related questions you can explore:

  1. What are the different methods for solving a system of linear equations?
  2. How would the solution change if the system had no solution or infinitely many solutions?
  3. Can the elimination method be used for non-linear equations?
  4. How can you check if the solution is correct?
  5. What would happen if the coefficients of xx and yy were both 0?

Tip: Always check your solution by substituting the values of xx and yy back into the original equations to verify the correctness.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Algebra
Systems of Linear Equations
Elimination Method

Formulas

Basic linear equation solving rules (e.g., ax + b = c)
Addition of equations to eliminate variables

Theorems

Principle of Equality
Linear Equation Solution Methods

Suitable Grade Level

Grades 8-10