Hi

4x+5y<=20  OR y <= (-4/5)x + 4  Slope m = (-4/5) and y-intercept Pt(0,4)

I. Graph line:  Plot y-intercept and find at least one more PT using the slope

Note: as y increases/decreases by 4, x increases/decreases by 5 in opposite direction



II. Shade portion represented by the inequality: 

In this example: below and including the line



 
Solved by pluggable solver: Plot Any Inequality
Graphing function : 

  

  

 

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