Réponses

Meilleure réponse !
2014-06-10T13:17:04+02:00
7y + 5 = 3y + 8
7y - 3y = 8 - 5
4y = 3
y = 3/4

a)
4y + 5 = 3y + 8
4y - 3y = 8 - 5
y = 3

b)
7y = 3y + 4
7y - 3y = 4
4y = 4
y = 4/4
y = 1

c)
14y + 10 = 6y + 16
14y - 6y = 16 - 10
8y = 6
y = 6/8
y = 3/4
C'est la seule équation qui admet la solution proposée

d)
7y - 5 = 3y + 1
7y - 3y = 1 + 5
4y = 6
y = 6/4
y = 3/2