Jawabanmu

2014-06-16T20:43:05+07:00
2x-y=6
2y+3z=4
3x-z=8
(2x+3x) + (2y+{-y}) + (3z+{-z}) = 6+4+8

5x + y + 2z = 18

2014-06-16T20:47:01+07:00
+ \left \{ {{2x-y=6} \atop {2y+3z=4}} \right. = 2x+y+3z=10
+  \left \{ {{2x+y+3z=10} \atop {3x-z=8}} \right. = 5x+y+2z= 18
a.18 b.16 c.14 d..12 e.10
5x+y+2z=18. jawabannya A.