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2) x-y= -1
Despejamos x...
2) x= y-1
Reemplazamos...
2(y-1)+y=3
2y-2+y=3
3y=5
y=5/3
y= 1.6
Reemplazamos y.
x-1.6= -1
x= 1.6-1
x= 0.6