Hello

I have this problem

Problem:

Solve the following differential equation by usingthree different methods:

$\displaystyle (xy-1+y)dx+xdy=0$

Solution:

One method is finding the integrating factor which is $\displaystyle e^x$ which found by the formula $\displaystyle \displaystyle e^{\displaystyle \int \dfrac{\dfrac{\partial M}{\partial y}-\dfrac{\partial N}{\partial x}}{N} \, dx}$

what are the other 2 methods??