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2x+y+z=4
____________ -
-x+y=0......(*)
2x+y+z=4
3x+y-z=3
___________ +
5x+2y=7..(**)
(*) & (**)
-x+y=0. |x2|
5x+2y=7. |x1|
----------------
-2x+2y=0
5x+2y = 7
----------------- dikurang
-7x = -7
x= 1
5(1)+2y=7
2y=2
y=1
x+2y+z=4
1+2(1)+z=4
z = 1
hp ={1,1,1}