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How many ordered pairs $(x,y)$ of positive integers satisfy the inequality $4x+5y < 20$?

 Apr 29, 2021
 #1
avatar+121048 
+1

See the  graph here  :  https://www.desmos.com/calculator/jn9lm00kci

 

The  pairs are

 

(1, 1)      (2, 1)

(1, 2)      (2, 2)

(1, 3)      (3, 1)

 

cool cool cool

 Apr 29, 2021

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