2x+y=5. 3x-y=0 va rog frumos
![2xy5 3xy0 Va Rog Frumos class=](https://ro-static.z-dn.net/files/d3c/d8e30cbf31e14ca2f921e03ae91b19ae.png)
Răspuns:
+y si -y sunt deja opusi
5x / = 5
x=5:5
x=1 => 2x+y=5
2*1+y=5
2+y=5
y=5-2
y=3 => x=1 y=3