Hello, pungakitty!
Sorry, the work you showed makes no sense . . .
Graph the inequality: .
We have two inequalties:
. .
Solve for
Then graph the two inequalties.
Graph the line: .
. . and shade the region below the line.
Code:

:\ 
::\ 
:::\ 
::::\
:::::*12
:::::\
::::::\
:::::::\
::::::::\
:::::::::\
::::::::::\
:::::::::::\
::::::::::::\
:::::::::::::\
 :::+:::::\   
:::::::::::::::\
::::::::::::::::\
:::::::::::::::::\

Graph the line: .
. . and shade the region above the line.
Code:

:::::::::::::::::::::
:::::::::::::::::::::
:::::::::::::::::::::
:::::::::::::::::::::
:::::::::::::::::::::
:::::::::::::::::::::
\:::::::::::::::::::
\::::::::::::::::::
\:::::::::::::::::
\::::::::::::::::
3*::::::::::::::::
\:::::::::::::::
 \::::::::::::::
   + \::::::  
 \::::::::::::
 \:::::::::::
 \::::::::::

The solution is the region common to both shadings.
Code:

:\ 
::\ 
:::\ 
::::\
:::::*12
:::::\
::::::\
\:::::\
\:::::\
\:::::\
\:::::\
3*::::::\
\::::::\
 \::::::\
    + \:::\   
 \::::::\
 \::::::\
 \::::::\
 \::::::\
