Bonsoir,
[tex] \left \{ {{7x + y = 3} \atop {-11x-3y=15}} \right.
\left \{ {{21x+3y=9} \atop {-11x-3y=15}} \right.
\left \{ {7x+y=3} \atop {10x=24}} \right.
\left \{ {{7x+y=3} \atop {x=2.4}} \right.
\left \{ {{y=-13.8} \atop {x=2.4}} \right. [/tex]
Bonne soirée,
Julien.
