Réponse :
x : 4x- 9
1. a. -21 b. -9 c. -7 d. -10
2. *a. 4x - 9 = 3 4x = 3+9 =12 x = 12/4 = 3
*b. 4x - 9 = 0 4x = 9 x = 9/4
*c. 4x - 9 = -1 4x = - 1 + 9 = 8 x = 8/4 = 2
*d. 4x - 9 = 7 4x = 7 + 9 = 16 x = 16/4 = 4
*e. 4x - 9 = -17 4x = -17 + 9 = 8 x = 8/4 = 2
Explications étape par étape :