Good Morning regression analysis experts , I would like some detailed explanation for the following question

please to ensure the solution is written very clearly and the steps to the solution are well explained

Let the sample regression line be Vi = bot bix, + el = Di + e, (i = 1, 2,. ......,n) and let x and y denote the sample means for the independent and dependent variable. a. Show that ei = yi - y - b(x; - x) b. Using the result in part a, show that =1 ei = 0 c. Using the result in part a, show that Et, e? = Er-, (Vi - v)2 - be Er, (x1 - 8)2 d. Show that V - y = bi(x; - x) e. Using the results in parts c and d, show that SST = SSR + SSE