Question 999636

{{{x + y > 3}}}
{{{x + y < -4}}}
----------------------

{{{ y >-x+3}}}
{{{y <-x -4}}}

solve as equality:

{{{ y =-x+3}}}
{{{y =-x -4}}}

so, we need {{{x}}} that makes {{{-x+3=-x -4}}}; as you can see, we have {{{-x}}} on both sides, so they cancel each other 
that means  there is no solution exist, the lines are paralel

{{{-x+3<y<-x -4}}}


{{{ graph( 300, 200, -6, 5, -10, 10, -x -4, -x+3,-x+3<y<-x -4) }}}