1. The problem statement, all variables and given/known data Let the surface S be the part of the plane 2x-y+z=3 that lies above the triangle in the xy plane that is bounded by the lines y=0, x=1 and y=x. Find the total mass of S if its density (mass per unit area) is given by ρ(x,y,z)= xy+z 2. Relevant equations 3. The attempt at a solution Ok so i know this is a double integral. the limite will be 0≤x≤1 0≤y≤2x-3 and f'(x)= 2, f'(y)= -1 √(f'(x) + f'(y) + 1)= √6 so my equation is √6∫∫(xy+z) and i have a feeling im meant to convert this into polar coordinates but how do you convert the limits to polar coordinates?