Bonjour,
Méthode par substitution:
[tex] \left \{ {{4x-5y=2} \atop {-x+3y=3}} \right. [/tex]
[tex] \left \{ {{4x-5y=2} \atop {-x=-3y+3}} \right. [/tex]
[tex] \left \{ {{4x-5y=2} \atop {x=3y-3}} \right. [/tex]
[tex] \left \{ {{4(3y-3)-5y=2} \atop {x=3y-3}} \right. [/tex
][tex] \left \{ {{12y-12-5y=2} \atop {x=3y-3}} \right.
[tex] \left \{ {{7y=14} \atop {x=3y-3}} \right. [/tex]
[tex] \left \{ {{y=14/7
[tex] \left \{ {{y=2} \atop {x=3(2)-3}} \right.
[tex] \left \{ {{y=2} \atop {x=3}} \right. [/tex]
