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rezolvati in multimea numerilor reale sistemul de ecuatii
2x-y=1
x+y=--4


Răspuns :

x=-4-y
2(-4-y)-y=1
-8-2y-y=1
-8-3y=1
-3y=9  y=9/(-3)=-3, y=-3
x=-4-(-3)=-4+3=-1, y=-1