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x+2y=1 (2)
------------------×
2x-y=7
2x+4y=2
---------------- -
-5 y= 5
Y=5/-5
Y=-1
Subtitusini
2x-y=7
2x-(-1)=7
2x+1=7
2x=7-1
2x=6
X=6/2
X=3
Jadi (-1,3)