Résolution d'un système par substitution


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Que signifie "Résoudre un système par substitution" ? On utilise l'une des équations pour exprimer l'une des inconnues en fonction de l'autre. Ensuite, dans l'autre équation on remplace cette inconnue par l'expression trouvée. On obtient une équation à une inconnue que l'on sait résoudre.

Comment résoudre un système d'équation à 2 inconnu par substitution ?

Pour résoudre un système de deux équations linéaires à deux inconnues par la méthode de substitution, il suffit d'isoler l'une des inconnues dans l'une des équations et de remplacer cette inconnue par sa valeur dans l'autre équation.

Comment résoudre un système d'équation à 3 inconnu par substitution ?

Résoudre un système de trois équations d'inconnues x, y et z revient à chercher tous les triplets (x ; y ; z) qui vérifient ces trois équations.
. Un tel triplet de valeurs (x ; y ; z) est appelé « solution du système d'équations ».

Comment résoudre un système par combinaison ?

La résolution d'un système d'équations à deux variables consiste à trouver le point de rencontre entre les équations.
. Lorsqu'il existe, ce point de rencontre est un couple (x,y) .
. Cela est possible lorsque les deux droites sont sécantes.










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