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C) 3x+y-z=1
B)6x-2y-z=-14. ___________
_________ 5x+4y=2
8x+y=-13
8x+y=-13
5x+4y=2. X= -13-y x = 2-4y. 16-32y=65-5y
____ ____ y= 3
8. 5
8x+3=-13
X=-2
-6+3-z=1
-z=4
Z=-4