Question 417341
3x-y<=-3
+y
3x+y-y<=-3+y
3x<=-3+y
+3
3x+3<=y

y>=3x+3

The boundary 
{{{graph(300,300,-5,5,-5,5,y=(3x+3))}}}

The inequality

{{{graph(300,300,-5,5,-5,5,y>=(3x+3))}}}