[See Solution] Solve for X, Y, and Z in the following systems of three equations using either substitution or elimination methods: X + 2Y + Z = 6 X + Y


Question: Solve for X, Y, and Z in the following systems of three equations using either substitution or elimination methods:

  1. X + 2Y + Z = 6
    X + Y = 4
    3X + Y + Z = 8
  2. 10X + Y + Z = 12
    8X + 2Y +Z = 11
    20X - 10Y - 2Z = 8
  3. 22X + 5Y + 7Z = 12

10X + 3Y + 2Z = 5

9X + 2Y + 12Z = 14


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