Question

Rezolvati sistemul de ecuatii: $\left \{ {{x-2y=8} \atop {3x+y=3}} \right.$
Rezultatul este: x=2, y=-3
Imi trebuie rezolvarea!!!Urgenttttttttttttttt :***

Answer 1

inmultim prima relatie cu -3
$\left \{ {{-3x+6y=-24} \atop {3x+y=3}} \right.$
$\left \{ {{3x+y=3} \atop {7y=-21}} \right.$
$\left \{ {{3x+y=3} \atop {y=-3}} \right.$
$\left \{ {{y=-3} \atop {3x-3=3}} \right.$
$\left \{ {{y=-3} \atop {3x=6}} \right.$
$\left \{ {{y=-3} \atop {x=2}} \right.$