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Solving Systems of Equations by the Addition (Elimination) Method

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2x-y-z=3
3x+y+2z=4
4x+2y-z=-4

2x + 3y-2z = -11
3x-2y +3z=7
x-4y+4z=14

Solve one problem below by Gauss-Jordan elimination method
-x+y=1
2x-3y=-7

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2x-y-z=3 (1)
3x+y+2z=4 (2)
4x+2y-z=-4 (3)

Add up one and two
5x+z = 7 (1a)

Multiply (1) with (2)
6x+2y+4z=8 ...

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