Math Problem Statement

Solve the system of equations using the elimination method: -8x + 8y = 8 3x - 4y = -12

Solution

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

8x+8y=8-8x + 8y = 8 3x4y=123x - 4y = -12

Step 1: Multiply the equations to align coefficients

We want to eliminate one variable. Let's eliminate y by making the coefficients of yy equal. The least common multiple of 8 and 4 is 8, so we multiply the second equation by 2:

8x+8y=8-8x + 8y = 8 (3x4y)×2=(12)×2(3x - 4y) \times 2 = ( -12) \times 2

6x8y=246x - 8y = -24

Step 2: Add the equations

(8x+8y)+(6x8y)=8+(24)(-8x + 8y) + (6x - 8y) = 8 + (-24)

2x=16-2x = -16

Step 3: Solve for xx

x=162=8x = \frac{-16}{-2} = 8

Step 4: Substitute x=8x = 8 into one of the original equations

Using 8x+8y=8-8x + 8y = 8:

8(8)+8y=8-8(8) + 8y = 8

64+8y=8-64 + 8y = 8

8y=728y = 72

y=9y = 9

Final Answer:

(x,y)=(8,9)(x, y) = (8, 9)

Would you like a more detailed breakdown of any step?

Here are 5 related questions you might find interesting:

  1. How does the elimination method compare to the substitution method?
  2. What happens if both variables get eliminated and you get a true statement like 0=00 = 0?
  3. How do you solve a system of three equations using elimination?
  4. Can elimination be used if the equations involve fractions?
  5. What is the graphical interpretation of solving a system using elimination?

Tip: Always check your solution by plugging xx and yy back into the original equations!

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Math Problem Analysis

Mathematical Concepts

Systems of Equations
Elimination Method
Linear Equations

Formulas

Elimination Method: Ax + By = C
Substituting x or y to solve for the remaining variable

Theorems

Linear Combination Theorem

Suitable Grade Level

Grades 8-10