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-x + 2y = 1
6x + 2y = 8
-x + 2y = 1
----------------- dikurangi
7x = 7
x = 1
3x + y = 4
3 x 1 + y = 4
3 + y = 4
y = 1
-x+2y=1 disubtitusikan jadi -x+2(-3x+4)=1
-x-6x+8=1
-7x+8=1
-7x=1-8
-7x=-7
x=-7/-7
x=1
3x+y=4
3(1)+y=4
3+y=4
y=4-3
y=1
maaf kalo salah