Question 23211
Apparently these are two unrelated inequalities??

{{{2b-12 >= 13}}}
{{{2b-12+12 >= 13+12}}}
{{{2b>= 25}}}
{{{b>= 25/2}}} or
{{{b>= 12.5}}}

On the numberline locate the number 12.5, and shade from that point to the right.  Do NOT include the endpoint!


{{{18<= 6y -12}}}
{{{18 - 6y <= 6y-6y -12}}}
{{{18-6y <= -12}}}

{{{18-18 -6y <= -12-18}}}
{{{-6y <= -30}}}


Now, here is the key step.  Whenever you multiply or divide both sides of an inequality by a negative number, you must REVERSE the inequality.
{{{-6y <= -30}}}
{{{(-6y)/-6 >= (-30)/(-6)}}}
{{{ y >= 5}}}


Locate the number 5 on the numberline, and shade everything to the right of 5, and also INCLUDE the 5.  


R^2 at SCC