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Britishone
@Britishone
April 2019
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salut quelqu'un pourrai m'aider pour les exos 2 et 4 stp! j'ai commencer le petit (a) mais je m'embrouille vraiment! ce serai très gentil de votre part merci d'avance!❇
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Commentaires (1)
X+2y = 5
3x+2y = 7
ds x+2y = 5 on substitue : x = -2y+5 et on remplace x ds l'autre équation :
3(-2y+5)+2y = 7
-6y+15+2y = 7
-4y = -15+7
y = 2
on calcule x :
x+2y = 5
x+4 = 5
x =-4+5
x =1
on verifie :
3x+2y = 7
3+4 = 7
essaie de faire b
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3x+2y = 7
ds x+2y = 5 on substitue : x = -2y+5 et on remplace x ds l'autre équation :
3(-2y+5)+2y = 7
-6y+15+2y = 7
-4y = -15+7
y = 2
on calcule x :
x+2y = 5
x+4 = 5
x =-4+5
x =1
on verifie :
3x+2y = 7
3+4 = 7
essaie de faire b