Ответ:
1) (x,y)=(-1,-5)
2)5x-y=0
x-y=4
3)(x,y)=(1,-2)
4)2x+y=0
x-y=3
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Ответ:
1) (x,y)=(-1,-5)
2)5x-y=0
x-y=4
3)(x,y)=(1,-2)
4)2x+y=0
x-y=3