When graphing a function we must know which sing we are using on the inequalities
[tex]<,\leq,>,\ge[/tex]
according to the symbol we are using, it will define if the circle is closed or open.
for symbols
[tex]\ge;\leq[/tex]
we use closed circles.
and for symbols
[tex]<;>[/tex]
we use open circles.
Example
[tex]y=0;x\ge2[/tex]
now if the equations were like this
[tex]y=0;x>2[/tex]
graph should look like this
