Question 430049
4x+5y<=20
5y<=-4x+20
/5
y<=-4x/5 +4
x=0,y=4 (0,4)
y=0,x=5 (5,0)

For defining the boundary find the y& x  intercept points. Join them and draw the line. Since y is < than someting all points below the line  are solutions to the inequality.
The boundary

{{{drawing(300,300,-10,10,-10,10,circle(0,4,0.3),circle(5,0,0.3),graph(300,300,-10,10,-10,10,y=(-4x/5)+4))}}}

The inequality
{{{drawing(300,300,-10,10,-10,10,circle(0,4,0.3),circle(5,0,0.3),graph(300,300,-10,10,-10,10,y<=(-4x/5)+4))}}}

m.ananth@hotmail.ca