Re: DSE 2011 Q 2

Posted by Homer Simpson on Jun 15, 2014; 7:44am
URL: http://discussion-forum.276.s1.nabble.com/DSE-2011-Q-2-tp7592769p7592772.html

2(c)  take any (x,y) - suppose (0,3) (-1,-4) (-2,4) (3,-2)

then f(x,y) = (0-3,0+3) = (-3,3)
               = (-1+4, -1-4) = (-3,-5)
               = (-2-4, -2+4) = (-6,2)
               = (3+2, 3-2) = (5,1)

so the range could be in any quadrant - matlab pura plane gets covered anyway.
(others please correct me if the reasoning is wrong!)