Réponses

2013-08-26T17:05:41+02:00
Bob :
2x+12 >= 5x+8
2x+12-5x-8 >= 0
-3x+4 >= 0
-3x >= -4
x <= 4/3.

Janice :
5-2x < 4
-2x < 4-5
-2x < -1
x > 1/2

Rachel :
3x+2 < -7
3x < -7-2
3x < -9
x < -3

Joé :
5x+21 >= 2(x+3)
5x+21 >= 2x+6
5x+21-2x-6 >= 0
3x+15 >= 0
3x >= -15
x >= -5