2) 1-5=3z-2,6z
-4=0.4z
z=-0,1
3) 5у+8у=100-9
13у=91
у=7
4) х-50+х=12
х+х=12+50
2х=62
х=31
5) 18-3х-4-2х=-6
18-4+6=2х+3Х
20=5х
х=4
1) [6;10]
-----®--------------------®----- >
6 xxxxxxxxxxxxx 10
2) [-5;-1]
------®--------®---------------------- >
-5 xxxx -1
3) [-9;3)
-----®-------------------------o---------- >
-9 xxxxxxxxxxxxxxxx 3
4 (-1;7]
----------------o----------------------------®------ >
-1 xxxxxxxxxxxxxxxxxx 7
5) (-∞;15)
-------------o----------------------------------- >
Xxxxxxxxx 15
6) (8;+∞)
---------------------------o-------------------------- >
8 xxxxxxxxxxxxxxxxx
7) (-∞; 2]
--------------------------®--------------------------- >
Xxxxxxxxxxxxxxxxxx 2
8) [-3;+∞)
----------------------------------®------------------------------- >
-3 xxxxxxxxxxxxxxxxxxxx