Question 853553
{{{ y<=x+4 }}}
{{{ x-y<=3 }}}
Let's solve for y in the second equation.
{{{ x-y<=3 }}}
add -x to each side
{{{ -y<=-x+3 }}}
Multiply each side by (-1).  This changes the direction of the inequality.
{{{ y>=x-3 }}}
Rewrite as
{{{ x-3<=y }}}
So we have {{{ x-3<=y }}} and {{{ y<=x+4 }}}
or
 {{{ x-3<=y<=x+4 }}}