bonjour
a) 5x - 2 ≤ 4x + 3
5x - 4x ≤ 3 + 2
x ≤ 5
S = ]-∞ ; 5]
0 1 2 3 4 5
---------------•-----------•-----------•-----------•-----------•-----------]-----------•---------->
b) 4x - 6 ≤ 13(x + 2)
4x - 6 ≤ 13x + 26
- 6 - 26 ≤ 13x - 4x
-32 ≤ 9x
9x ≥ -32
x ≥ -32/9
S = [-32/9 ; + ∞[
-4 -3 -2 -1 0 1
--------------•-----[------•-----------•-----------•-----------•-----------•-----------•--------------->
-32/9
