Re: DSE 2015 answer

Posted by Mike on Jun 05, 2016; 10:12am
URL: http://discussion-forum.276.s1.nabble.com/DSE-2015-answer-tp7600806p7601209.html

Try to plot the graph for f(x,y)=2,
X+y+xy =2 , now write y as a function of x. Than find the first derivative and second derivative. Your graph will be convex to the origin. So answer - when f(x,y)>=c