Determine the type of the differential equation $e^{-y}(1+ \dot y)=1$

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Hey Guys I have the following to do:

Equation: $$e^{-y}(1+ \dot y)=1$$

a) Determine the type of the differential equation (is it linear/nonlinear, separable/non-separable, homogeneous/non-homogeneous)?

b) Find the particular solution subject to the initial condition $y(0) = –\ln 2$.

c) Plot the solution in the interval $t \in [–5, 5]$.

So far I understand that the equation is non linear, and non separable however I am not quite sure. With the rest of the question I am pulling complete blanks. Any tips where to start? Cheers