Sagot :
Réponse :
Bonjour
Explications étape par étape :
Résolutions d'équation
-3x = 12
x = 12/-3 = -4
4x + 9 = 5
4x = -9 + 5
4x = -4
x = -4/4 = -1
6x + 15 = 9x
6x -9x = -15
-3x = -15
x = -15/-3 = 5
3 - 2x = 4x -9
-2x -4x = -3 -9
-6x = -12
x = -12/-6 = + 2
Réponse:
a ) -3x = 12
= -3x/ -3 = 12/ -3
x = -4
b ) 4x + 9 = 5
4x +9 -9 = 5 -9
4x = -4
4x / 4 = -4/ 4
x = -1
c 6x + 15 = 9x
= 6x - 9x = -15
= -3x = -15
= -3x / -3 = -15/-3
x = 5
d 3- 2x = 4x -9
= -2x - 4x = - 3 -9
-6x = - 12
= -6x/ -6 = -12/ -6
x = 2