Question 975391: Solve for the ff systems:
3x + 2y + z = 2
4x + 2y + 2z = 8
x - y + z = 4
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! Solve for the ff systems:
3x + 2y + z = 2
4x + 2y + 2z = 8
x - y + z = 4
---------------
3x + 2y + z = 2
4x + 2y + 2z = 8
------------------- Subtract
-x - z = -6 Eqn A
========================
3x + 2y + z = 2 Eqn 1
2x - 2y + 2z =8 Eqn 3 times 2
---------------------------- Add
5x + 3z = 10
-3x -3z = -18 Eqn A times 3
------------------------------- Add
2x = -8
x = -4 *****************************
-x - z = -6 Eqn A
z = 10 *****************************
x - y + z = 4
y = 2 ******************************
(-4,2,10)
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