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02-12-2016
Mathematics

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-6x+4y+4z=6
-5x+2y-4z=23
2x+5y-4z=25

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02-12-2016

-6x+4y+4z=6
-5x+2y-4z=23
----------------------
-11x+6y =29

-5x+2y-4z=23
2x+5y-4z=25
-------------------
7x + 3y = 2
3y=2-7x
6y=4-14x = 29+11x
25x = -25
x = -1

2y=2-7x
3y = 2+7 =9
y=3

-6x+4y+4z = 6
6+12+4z = 6
4z = 12
z = 3

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