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Ley2wice
@Ley2wice
April 2019
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Aidez-moi SVP SVP URGENT!Résoudre le système de 3 equations a 3 inconnues
x-3y=8
4x+2y=-10
2x-6+4z=24
Meerci Beaucoup!
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senmusa
X - 3y = 8 <==> x = 8+3y (1)
(2) devient: 4x +2y = -10 <==>4(8+3y) +2y = -10<==> 14y =-42 ==> y= -42/14 = - 3
on remplace la valeur de y trouvé dans (1) : x = 8+3(-3) = 8-9=-1
finalement (3) devient : 2(-1) -6 + 4z = 24 <==> 4z= 32 ==>z=8
Solution : { (-1; -3 ; 8) }
1 votes
Thanks 1
ley2wice
Merci Beaucoup!!
senmusa
de rien , pour s'assurer que les reponse sont correcte on remplace toujours les resultats trouvés dans leur equation respective et l'égalité doit être respecté. Sinon, on aura commis une erreur
ley2wice
D'accord encore Merci :) !
senmusa
de rien à votre service
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(2) devient: 4x +2y = -10 <==>4(8+3y) +2y = -10<==> 14y =-42 ==> y= -42/14 = - 3
on remplace la valeur de y trouvé dans (1) : x = 8+3(-3) = 8-9=-1
finalement (3) devient : 2(-1) -6 + 4z = 24 <==> 4z= 32 ==>z=8
Solution : { (-1; -3 ; 8) }