The way to type ≥ is to hold down the Alt key while
typing 242 on the number pad at the far right of your
keyboard.  Then when you take your finger off the Alt key,
it will magically appear on the screen.  To type ≤, do 
the same but type 243 instead. 

4x+6≤-2 or 2x+2≥12
  4x≤-8 or   2x≥10
   x≤-2 or    x≥5

<=========☻--------------------☻=========>
-5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8

[You can make those black smiley faces with 258, and a white
one with 257.   ☺]
 
Edwin