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Solve the system of equations. x + y + z = 0 x - y + 5z = 22 2x + y + z = 2 A. {(2, -5, 3)} B. {(-5, 2, 3)}...

Solve the system of equations.
x + y + z = 0
x - y + 5z = 22
2x + y + z = 2
A. {(2, -5, 3)}
B. {(-5, 2, 3)}
C. {(3, -5, 2)}
D. {(3, 2, -5)}

Answer

Solution:

  1. Equation 1: x + y + z = 0
  2. Equation 2: x - y + 5z = 22
  3. Equation 3: 2x + y + z = 2

Let's solve the system using substitution or elimination:

  1. From Equation 1: y = -x - z
  2. Substitute y in Equation 3: 2x + (-x - z) + z = 2, simplifying gives x = 2
  3. Substitute x = 2 in Equation 1: 2 + y + z = 0, so y + z = -2
  4. Substitute x = 2 in Equation 2: 2 - y + 5z = 22, so -y + 5z = 20
  5. From y + z = -2, y = -2 - z
  6. Substitute y = -2 - z in -y + 5z = 20: -(-2 - z) + 5z = 20, simplifying gives 6z = 18, so z = 3
  7. Substitute z = 3 in y = -2 - z: y = -2 - 3 = -5
  8. Solution: x = 2, y = -5, z = 3

Answer: A. {(2, -5, 3)}

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