Check that the equation below is not exact but becomes exact when multiplied by the integrating factor. xy+x(1+ y)y = 0 Integrating factor: u(x, y) = 1/(xy). Solve the differential equation. You can define the solution curve implicitly by a function in the form F(x,y) = G(x)+H(y) = K for some constant K. F(x, y) =