Bonjour,
a) 6x +5 ≥ 4x -1
6x - 4x ≥ - 1 - 5
2x ≥ - 6
x ≥ - 6/2
x ≥ - 3
b) -5x -6 < -x +4
- 5x + x < 4 + 6
- 4x < 10
x > - 10/4
x > - 5/2
x > - 2,5
c) 5x +1 ≤ 4x +5
5x - 4x ≤ 5 - 1
x ≤ 4
d) -3x +6 > 4x -9
- 3x - 4x > - 6 - 9
- 7x > - 15
x < 15/7
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Bonjour,
a) 6x +5 ≥ 4x -1
6x - 4x ≥ - 1 - 5
2x ≥ - 6
x ≥ - 6/2
x ≥ - 3
b) -5x -6 < -x +4
- 5x + x < 4 + 6
- 4x < 10
x > - 10/4
x > - 5/2
x > - 2,5
c) 5x +1 ≤ 4x +5
5x - 4x ≤ 5 - 1
x ≤ 4
d) -3x +6 > 4x -9
- 3x - 4x > - 6 - 9
- 7x > - 15
x < 15/7