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2x-y=-1.... pers(2)
~eliminasi pers 1 & 2
pers 1(dikali 2)
pers 2(dikali 1)
-2x-2y=6
2x-y=-1
______ +
-y=5
y=-5
~y=-5 subsitusi ke pers 1
-x-(-5)=3
-x+5=3
-x=3-5
-x=-2
x=2
hp{2,-5}