Posted by knowpraveen on Jun 10, 2016; 5:48pm URL: http://discussion-forum.276.s1.nabble.com/joint-probability-question-tp7601363p7601370.html
This stems from the definition of uniform distributions. Just like we use the image of a straight line to picture a monovariate distribution, for a bivariate distribution it's really going to save our time if we use the co-ordinate axes.