Réponses

2014-05-09T22:37:42+02:00
Bonsoir,

1) 10x - 2 = 0
10x = 2
x = 2/10
x = 1/5

2) -4 y + 3 = -5
-4y = -5 - 3
-4y = -8
y = -8/(-4)
y = 2

3) 3x + 7 = -2x - 8
3x + 2x = -8 - 7
5x = -15
x = -15/5
x = -3
Meilleure réponse !
2014-05-09T22:38:44+02:00
1°) 10x - 2 = 0
10x - 2 +2 = 0+ 2
10x=2
10x/10= 2/10

X = 2/10

2°) - 4y + 3 = -5
 -4y +3 -3 = -5 -3
-4y = -8
-4y/-4=  -8/-4
y = 2

3°) 3x + 7 = -2x -8
3x+ 7 -7 = -2x -8 -7
3x + 2x = -2x + 2x -15
5x/5 = -15/5
x = -3 

Voilà :)