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x+y=6
2x-y=6
________ +
3x= 12
x=4
x+y=6
4+y=6
y=6-4
y=2
(x,y) = (4,2)
nomor 2
x-2y=5
2x=y-4 menjadi 2x-y=4
x-2y=5 | x2 | 2x-4y=10
2x-y=4 | x1 | 2x-y= 4
__________ -
-5y=6
y=-6/5 = -1 1/5
x-2y=5
x-6/5 =5
x= 5+6/5
x=6 1/5
(x,y) = (6 1/5, -1 1/5)