Question 393858
{{{3n + 6*(n - 12) >= 9}}}
{{{3n + 6n - 72 >= 9}}}
{{{9n - 72 >= 9}}}
{{{9n >= 81}}}
{{{n >= 9}}}
If I plot {{{n}}} on the horizontal axis, and
I call the vertical axis {{{f(n)}}}, then the 
solution should be every point on and to the 
right of the vertical line through the point
(9,0). {{{f(n)}}} isn't defined.