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Xav54
@Xav54
June 2021
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Exercice 30 , 16 point en en jeu !! Merci à ceux qui m'aideront !!
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Thomas1106
X : le prix d'un chocolat
y : le prix d'un jus de fruit
(a) 3x+2y = 33
(b) x+4y = 36
(b) x = 36-4y
Remplaçons x par sa valeur dans l'équation (a)
(a) 3x+2y = 33
3*(36-4y)+2y = 33
108-12y+2y = 33
-10y+108 = 33
-10y+108
-108
= 33
-108
-10y = -75
y = -75/(-10)
y = 7,5
(b) x = 36-4y
x = 36-4*7,5
x = 36-30
x = 6
Un chocolat coûte 6 F , tandis qu'un jus de fruit coûte 7,5 F .
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Lista de comentários
y : le prix d'un jus de fruit
(a) 3x+2y = 33
(b) x+4y = 36
(b) x = 36-4y
Remplaçons x par sa valeur dans l'équation (a)
(a) 3x+2y = 33
3*(36-4y)+2y = 33
108-12y+2y = 33
-10y+108 = 33
-10y+108-108 = 33-108
-10y = -75
y = -75/(-10)
y = 7,5
(b) x = 36-4y
x = 36-4*7,5
x = 36-30
x = 6
Un chocolat coûte 6 F , tandis qu'un jus de fruit coûte 7,5 F .