Math Problem Statement

solve this by elimination 1: 3x +4y = -3 and 2x + 6y = 8

Solution

We can solve the system of equations by elimination.

The system of equations is:

  1. 3x+4y=33x + 4y = -3
  2. 2x+6y=82x + 6y = 8

Step 1: Multiply the equations

We want to eliminate one variable, so we need to manipulate the equations. First, multiply both equations by factors that make the coefficients of xx or yy the same.

To eliminate xx, we can multiply:

  • The first equation by 2: 2(3x+4y)=2(3)2(3x + 4y) = 2(-3)
  • The second equation by 3: 3(2x+6y)=3(8)3(2x + 6y) = 3(8)

This gives:

  1. 6x+8y=66x + 8y = -6
  2. 6x+18y=246x + 18y = 24

Step 2: Subtract the equations

Now, subtract equation 1 from equation 2 to eliminate xx:

(6x+18y)(6x+8y)=24(6)(6x + 18y) - (6x + 8y) = 24 - (-6)

This simplifies to:

10y=3010y = 30

Step 3: Solve for yy

y=3010=3y = \frac{30}{10} = 3

Step 4: Substitute yy back into one of the original equations

Now, substitute y=3y = 3 into one of the original equations (let's use the first one):

3x+4(3)=33x + 4(3) = -3 3x+12=33x + 12 = -3 3x=3123x = -3 - 12 3x=153x = -15 x=153=5x = \frac{-15}{3} = -5

Final Solution:

The solution is: x=5,y=3x = -5, \quad y = 3

Would you like further details on this process or have any questions?

Here are 5 related questions to expand on this:

  1. Can you solve a similar system of equations with different coefficients using elimination?
  2. How would you approach this problem if the coefficients of yy were the same initially?
  3. What happens if both equations are multiples of each other? How would you solve such a system?
  4. Can you use substitution instead of elimination for this system? What would be the steps?
  5. How can you verify that the solution is correct?

Tip: Always double-check your final answer by plugging the values of xx and yy back into the original equations to verify their correctness.

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Math Problem Analysis

Mathematical Concepts

Algebra
System of Linear Equations
Elimination Method

Formulas

Elimination of variables by subtraction or addition of equations

Theorems

Properties of Equality
Linear Combinations in Systems of Equations

Suitable Grade Level

Grades 8-10