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y-x=6 ...(1)
x-3y=8x+4y-28
28=7x+7y
y+x=4 ...(2)
eliminasi
y-x=6
y+x=4
tambahkan persamaan tersebut
y=10
subtitusi
y+x=4
10+x=4
x=-6
x-3y=8x+4y-28 <===>8x-x+3y+4y=28 <===> 7x+7y=28
7x-7y=42
7x-7y=28 -
x =0
y=0