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2x+5y=8
x+5y=2 (kedua ruas dikurang)
=x=6
x+5y=2
6+5y=2
5y=2-6
5y= -4
y= -4 per 5
b.5x-y=3 dan 10x-5y=15
5x-y=3 (×2) =10x-2y=6
10x-5y=15 (×1) =10x-5y=15 (kedua ruas dikurang)
=3y=-9
=y=-3
5x-y=3
5x-(-3)=3
5x+3=3
5x=3-3
5x=0
x=0