9. Let Evaluate F(x,y,z)=-i+zj+z²k F-dr over each of the following curves (assume each is oriented positively). (a) (10 points) C is the boundary of the part of the plane 2x+3y+z = 6 that lies in the first octant (b) (10 points) C is the curve of intersection of the paraboloid z = 9-1² - y² and the plane z = 5.