Several simple inequality problems! Urgent! Wait online, help! 1. According to the nature of inequality, when 1-a is negative, the inequality will change when both sides are divided by1-a.
So 1-A 1
2. Because |3M-5|=5-3M.
So 3M-5≤0
M≤5/3
3. T=2Y-X from ①.
Substitute ② to get 2X+Y=2Y-X-3.
Y=3X+3
When y >-3
3X+3>-3
Get x >-2
4. If the inequality group has a solution, then the solution set must be 3a-4 < x < 2.