Question

Rezolvati in multimea numerelor reale sistemul de ecuatii $\left \{ {{2x-y=1} \atop {x+y=-4}} \right.$

Answer 1

{ 2x-y = 1
{ x+y = -4

-y cu y se reduc :

3x = -3
x = -3/3
x = 1.

2x-y = 1
2-y = 1
-y = -1
y = 1.


J'espère aidé :)