Math Problem Statement

Solve the system of linear equations by elimination.

$8x-5y=11$8x−5y=11​

$4x-3y=5$

Solution

We are tasked with solving the system of linear equations using the elimination method:

(1)8x5y=11\text{(1)} \quad 8x - 5y = 11 (2)4x3y=5\text{(2)} \quad 4x - 3y = 5

Step 1: Eliminate one variable

To use elimination, we first manipulate the equations so that one variable has the same or opposite coefficient in both equations. Let's eliminate xx by multiplying equation (2) by 2:

2×(4x3y)=2×52 \times (4x - 3y) = 2 \times 5

This gives:

8x6y=108x - 6y = 10

Now we have the system:

(1)8x5y=11\text{(1)} \quad 8x - 5y = 11 (3)8x6y=10\text{(3)} \quad 8x - 6y = 10

Step 2: Subtract the equations

Next, subtract equation (3) from equation (1) to eliminate xx:

(8x5y)(8x6y)=1110(8x - 5y) - (8x - 6y) = 11 - 10

Simplifying both sides:

8x5y8x+6y=18x - 5y - 8x + 6y = 1

y=1y = 1

Step 3: Substitute y=1y = 1 back into one of the original equations

Now that we know y=1y = 1, substitute it into either of the original equations. Let's use equation (2):

4x3y=54x - 3y = 5

Substitute y=1y = 1:

4x3(1)=54x - 3(1) = 5

4x3=54x - 3 = 5

Add 3 to both sides:

4x=84x = 8

Solve for xx:

x=2x = 2

Final Answer:

The solution to the system of equations is:

x=2,y=1x = 2, \quad y = 1

Would you like more details or have any questions about this solution?

Here are 5 related questions for further practice:

  1. Solve the system of equations: 3x+2y=73x + 2y = 7 and 5xy=35x - y = 3 using elimination.
  2. Solve the system of equations: 4x3y=64x - 3y = 6 and 2x+y=42x + y = 4 using elimination.
  3. What is the elimination method and how does it compare to substitution for solving systems of equations?
  4. Solve the system of equations: x+3y=9x + 3y = 9 and 2xy=52x - y = 5 using elimination.
  5. Solve the system of equations: 6x7y=136x - 7y = 13 and 2x+3y=102x + 3y = 10 using elimination.

Tip: When using elimination, it's crucial to ensure that the coefficients of one variable (either xx or yy) match or are opposites in both equations. This will allow you to add or subtract the equations to eliminate that variable.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Elimination Method

Formulas

Elimination method for solving systems of linear equations

Theorems

Linear system solutions using elimination

Suitable Grade Level

Grades 8-10