Math Problem Statement

2x+y+2z= 2 2, x, minus, 7, y, minus, 8, z, equals, minus, 2 2x−7y−8z= −2 minus, 2, x, plus, 4, y, plus, 3, z, equals, 8 −2x+4y+3z= 8 Answer

Solution

The system of equations provided is:

1)  2x+y+2z=21) \ \ 2x + y + 2z = 2 2)  2x7y8z=22) \ \ 2x - 7y - 8z = -2 3)  2x+4y+3z=83) \ \ -2x + 4y + 3z = 8

We can solve this system of linear equations using methods like substitution, elimination, or matrix techniques such as Gaussian elimination. Let's solve it step-by-step using elimination or substitution.

Step 1: Add equations (1) and (3)

First, add equation (1) and (3) to eliminate xx:

(2x+y+2z)+(2x+4y+3z)=2+8(2x + y + 2z) + (-2x + 4y + 3z) = 2 + 8 0x+5y+5z=100x + 5y + 5z = 10 5y+5z=10(divide the whole equation by 5)5y + 5z = 10 \quad \text{(divide the whole equation by 5)} y+z=2(Equation 4)y + z = 2 \quad \text{(Equation 4)}

Step 2: Subtract equation (1) from (2)

Now subtract equation (1) from (2) to further reduce the system:

(2x7y8z)(2x+y+2z)=22(2x - 7y - 8z) - (2x + y + 2z) = -2 - 2 0x8y10z=40x - 8y - 10z = -4 8y10z=4(Equation 5)-8y - 10z = -4 \quad \text{(Equation 5)}

Step 3: Solve system with Equations (4) and (5)

We now have the reduced system of equations:

  1. y+z=2y + z = 2
  2. 8y10z=4-8y - 10z = -4

Substitute z=2yz = 2 - y (from equation 4) into equation (5):

8y10(2y)=4-8y - 10(2 - y) = -4 8y20+10y=4-8y - 20 + 10y = -4 2y20=42y - 20 = -4 2y=162y = 16 y=8y = 8

Step 4: Solve for zz

Now, substitute y=8y = 8 into equation (4):

8+z=28 + z = 2 z=28=6z = 2 - 8 = -6

Step 5: Solve for xx

Substitute y=8y = 8 and z=6z = -6 into equation (1):

2x+8+2(6)=22x + 8 + 2(-6) = 2 2x+812=22x + 8 - 12 = 2 2x4=22x - 4 = 2 2x=62x = 6 x=3x = 3

Final Solution:

The solution to the system of equations is: x=3, y=8, z=6x = 3, \ y = 8, \ z = -6

Would you like further details or explanations on any step? Here are 5 related questions to explore the topic further:

  1. How can you solve systems of equations using substitution?
  2. What is the Gaussian elimination method for solving linear systems?
  3. How can you express a system of equations as a matrix equation?
  4. How do linear systems relate to vector spaces?
  5. What are the conditions for a system of equations to have no solution, one solution, or infinite solutions?

Tip: Always check your solutions by substituting the values back into the original equations to ensure they satisfy all equations.

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Math Problem Analysis

Mathematical Concepts

Linear Algebra
Systems of Linear Equations
Substitution
Elimination

Formulas

System of linear equations: ax + by + cz = d
Substitution method
Elimination method

Theorems

Existence and uniqueness theorem for systems of linear equations
Gaussian elimination

Suitable Grade Level

Grades 9-12