Answered

Slt besoin d'aides pour les deux équations suivante svp
2x-5=4x+3 et 3(x+4)-7=15-2x

Sagot :

FAMILYS

Bonsoir,

2x - 5 = 4x + 3

2x - 5 - 2x = 4x + 3 - 2x

-5 = 2x + 3

-5 - 3 = 2x + 3 - 3

-8 = 2x

2x / 2 = -8 / 2

x = -4

Vérification : 2(-4) - 5 = -8 - 5 = -13

4(-4) + 3 = -16 + 3 = -13

3(x + 4) - 7 = 15 - 2x

3x + 12 - 7 = 15 - 2x

3x + 5 = 15 - 2x

3x + 5 - 3x = 15 - 2x - 3x

5 = 15 - 5x

5 - 15 = 15 - 5x - 15

-10 = -5x

-5x / -5 = -10 / -5

x = 2

Vérification : 3(2 + 4) - 7 = 6 + 12 - 7 = 18 - 7 = 11

15 - 2(2) = 15 - 4 = 11