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y=4-2x
3y-z=5
3(4-2x)-z=5
12-6x-z=5
-6x-z=-7
x+2z=3 | x-6
-6x-z=-7 | x1
------------------------
-6x-12z=-18
-6x-z=-7
---------------- (-)
-11z=-11
z=1
jawaban: D
x+y=1
x=1-y
y+z=6
y=6-z
2x+y+z=4
2(1-y)+6-z+z=4
2-2y+6=4
-2y=-4
y=2
y=6-z
2=6-z
z=4
x=1-y
x=1-2=-1
x+z=-1+4=3
jawaban: E