SOLUTION: Graph the inequality on a plane 4x+5y<=20

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Question 329962: Graph the inequality on a plane 4x+5y<=20
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
4x%2B5y%3C=20}
5y%3C=-4x%2B20
y%3C=-%284%2F5%29x%2B4
Graph the line,
y=-%284%2F5%29x%2B4
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graph%28300%2C300%2C-10%2C10%2C-10%2C10%2C-%284%2F5%29x%2B4%29
Pick a point in either region.
(0,0) is always a convenient point.
Test the inequality.
4x%2B5y%3C=20
4%280%29%2B5%280%29%3C=20
0%3C=20
True, (0,0) is in the solution region.
Shade that region.
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Solved by pluggable solver: Plot Any Inequality
Graphing function y%3C=-%284%2F5%29x%2B4:

graph%28+300%2C+300%2C+-10%2C+10%2C+-10%2C+10%2C+y%3C=-%284%2F5%29x%2B4+%29