Since we have 3x+4y, we want to maximize the x and y values we want to get as far top right as possible
hmm, I'm thinking it might be on the line 3x+4y=240 let's test the boundaries so the boundaries of that line are at (20,45) and (60,15) at (20,45), the value is 240 at (60,15), the value is 240 as well well, that doesn't work
so maybe it's somewhere between it
ok, so find the max value of 3x+4y=240
hold a sec, the line is 3x+4y=240 so the max value is 240
