Sagot :
Réponse :
bonjour
4 + x = - 7
x = - 7 - 4
x = - 11
6 - x = 13
- x = 13 - 6
- x = 7
x = - 7
4 x - 2 = 10
4 x = 10 + 2
4 x = 12
x = 3
5 x + 2 = 8 x - 3
5 x - 8 x = - 3 - 2
- 3 x = - 5
x = 5/3
6 x + 14 = - 8 x + 4
6 x + 8 x = 4 - 14
14 x = - 10
x = - 10/14 = - 5/7
Explications étape par étape
Réponse :
Bonjour.
Explications étape par étape
A/ 4+x = -7 <=> x = -7/-4 <=> x = 7/4
B/ 6-x = 13 <=> x = 13/6
C/ 4x-2 = 10 <=> 4x = 12 <=> 4x = 12 <=> x = 12/4 = 3
D/ 5x+2 = 8x-3 <=> 5x-8x = -3-2 <=> -3x = -5 <=> x = 5/3
E/
Valeur de b:
2(3b+7)=4(-2x+1) <=> 6b+14=4(−2x+1) <=> 6b+14=−8x+4 <=> 6b=−8x+4−14 <=> 6b=−8x−10 <=> (6b/6) = (-8-10) / 6 <=> b=(-8-10) / 6 <=> b=(-4x-5)/3
Valeur de x:
2(3b+7)=4(−2x+1) <=> 6b+14=4(−2x+1) <=> 6b+14=−8x+4 <=> −8x+4=6b+14 <=> −8x=6b+14−4 <=> −8x=6b+10 <=> x = (6b-10) / -8 <=> (-3-5) / 4
Bonne journée!!!