Someone has broken down the material that he has to study into two parts: part A and part B and has, at most, 2 hours
every evening over the next week to study.
He wants to spend at least twice as much time studying for part A as for part B.
Show graphically all the possible combinations of time that Tran can study for each part.
a >= 2b
a+b <= 2
if a = 2b, then 3b = 2 or b = 2/3
since a >= 2b, b <= 2/3 and a >= 4/3
If you graph those two lines (in QI, since both a,b >= 0), you can see the various combinations