Question 417066
{{{-8 <= 3x + 1 <= 16}}}
Subtract {{{1}}} 
{{{ -9 <= 3x <=15 }}}
Divide by {{{3}}}
{{{ -3 <= x <= 5 }}}
The graph is 2 vertical lines, one at {{{x = 5}}}
and the other at {{{x = -3}}}. The
solution is the space between the lines,
including the lines.