1. The problem statement, all variables and given/known data [PLAIN]http://img683.imageshack.us/img683/4744/leastsquares.jpg [Broken] [PLAIN]http://img149.imageshack.us/img149/4793/graphwd.jpg [Broken] 2. Relevant equations 3. The attempt at a solution So would these be the points? (-41,51),(-22,62),(23,63),(44,24) I'm not too sure how to evaluate the sigmas because it shows n as being the subscript up above in the directions but in the problem it shows i as being the subscript, and I don't understand how i can equal 1. When clearly the subscript is not always 1.