x+y=12
x-y=4
eliminasi/dikurang, nanti x nya habis:
2y=8
y=8/2
y=4
kemudian subtitusi:
x + (4) = 12
x=8
sehingga:
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x+y=12
x-y=4
eliminasi/dikurang, nanti x nya habis:
2y=8
y=8/2
y=4
kemudian subtitusi:
x + (4) = 12
x=8
sehingga:
x=8
y=4