Question

Rezolvati sistemul de ecuatii :
$\left \{ {{3x+y=-2} \atop {-5x-3y=2}} \right.$

Answer 1

3x+y=-2/*3
-5x-3y=2

9x+3y=-6
-5x-3y=2
____________
4x=-4
x=-1

-3+y=-2
y=-2+3
y=1

VERIFICARE:
5-3=2 A

Answer 2

o inmultim pe prima cu 3 si obtinem
9x+3y=-6
-5x-3y=2   prin adunarea celor 2 ecuatii obtinem
4x/=-4    x=-1

-3+y=-2
y=-2+3
y=1