Credits to Khan Academy
Lesson 3: : Modeling with linear inequalities
https://youtu.be/C_7Tqk9fw4k
Ksenia wants to chop broccoli "and carrots for a competition. "It takes her the same number of seconds "to chop each carrot, and it takes her the same number "of seconds to chop each broccoli head. "Her goal is to chop at least 20 vegetables "with a time limit of 540 seconds. "What is the least number of carrots Ksenia can chop while achieving her goal?
In the Khan Academy solution to this question the straight line through (0,15) and (30,0) was used. What information did Khan Academy use to draw this line?