Question 869964
{{{x+y<=4}}}
{{{y<=4-x}}}
{{{graph(300,300,-2,10,-2,10,y<=4-x)}}
.
.
.
{{{x+y>=1}}}
{{{y>=1-x}}}
{{{graph(300,300,-2,10,-2,10,y>=1-x)}}}}
.
.
.

{{{drawing(300,300,-2,10,-2,10,grid(1),
circle(0,1,0.2),
circle(1,0,0.2),
circle(0,4,0.2),
circle(4,0,0.2),
blue(line(0,1,0,4)),
blue(line(0,4,4,0)),
blue(line(4,0,1,0)),
blue(line(1,0,0,1)))}}}
I can't shade the region but it's the region outlined in blue.