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kurtarevenger
@kurtarevenger
June 2023
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105 (Calculer) Résoudre le svstème suivant d'inconnue (x; y) : x - 2y = 4 2x + 3y = -6
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australien
Par substitution x=4+2y
On remplace x ds l autre équation
2(4+2y)+3y=-6
8+4y+3y=-6
7y=-6-8
y=-2
x-2y=4
x+4=4
x=0
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On remplace x ds l autre équation
2(4+2y)+3y=-6
8+4y+3y=-6
7y=-6-8
y=-2
x-2y=4
x+4=4
x=0