1. The problem statement, all variables and given/known data A curve lamda starts in (0,0) and fallows a straight line from x = 0, y = 0 to x = 1, y = 0 and then another straight line to x = 2 and y = 1. Calculate the line integral I = S vdr where S is an integral s v = (x+3y)i + (3+y)j 2. Relevant equations 3. The attempt at a solution the first line y = 0 dy = 0 S x dx from 0 to 1 = 1/2 The second line x = t y = t dx = dt dy = dt S (t+3t)dt + (3+t)dt and here it stops. Both x and y are variables and x are supposed to go from 1 to 2 and y from 0 to 1.