Several simple inequality problems! Urgent! Wait online, help!

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.

So 3a-4 < 2

A