Show vour works 1· Use the transformation x-2u+v, y-u+2v to evaluate the integral (x - 3y)dA where R is the triangular region with vertices (0,0), (2,1) and (1,2) 2. Show that the line integral J ydx + (x + 2y)dy is dependent of path Evaluate the integral C is any path from (0,1) to (2,2) 3. Find the parametric representation for the part of the ellipsoid 9x2 + 4y2 +z2 1 that lies above xy-plane. Z- 4. Evaluate the integral JJ yz dS where S is the part of the plane x +y+z 1 that lies in the first octant.