Sagot :
Bonjour
Résoudre les équations d'inconnue x suivantes :
b. 4x + 15 = 7x + 24
4x - 7x = 24 - 15
- 3x = 9
x = - 9/3
x = - 3
d. 23x + 31 = 16x +17
23x - 16x = 17 - 31
7x = - 14
x = - 14/7
x = - 2
a. 7x + 17 = 9x + 29
7x - 9x = 29 - 17
- 2x = 12
x = - 12/2
x = - 6
c. 8x + 26 = 5x + 14
8x - 5x = 14 - 26
3x = - 12
x = - 12/3
x = - 4.
Réponse :
a. 7x + 17 = 9x + 29 <=> 9x -7x = -29 +17
<=> 2x = - 12
<=> x = -12/2
<=> x = -6
b. 4x + 15 = 7x + 24 <=> 7x -4x = 15 -24
<=> 3x = -9
<=> x = -9 / 3
<=> x = -3
c. 8x + 26 = 5x + 14 <=> 8x - 5x = 14 -26
<=> 3x = -12
<=> x = -12/3
<=> x = -4
d. 23x + 31 = 16x +17 <=> 23x - 16x = 17 -31
<=> 7x = -14
<=> x = -14 / 7
<=> x = -2
j'espère avoir pu aider.