[tex] \left \{ {{x+7y=3} \atop {3x-2y=32}} \right.[/tex]
pe prima o inmultim cu 3
[tex] \left \{ {{3x+21y=9} \atop {3x-2y=32}} \right.[/tex]
[tex]Scadem~cele~2 ~ ecuatii ~ si~avem:[/tex]
[tex]21y-(-2y)=9-32[/tex]
[tex]23y=-23=\ \textgreater \ \boxed{y=-1}[/tex]
[tex]x-7=3=\ \textgreater \ \boxed{x= 10} [/tex]
