2.  Which ONE of the following is a linea...

2.  Which ONE of the following is a linear non-homogeneous differential equation, where x and y are the independent and dependent variables respectively?

(A) \({dy\over dx}+xy=e^{-x}\)

(B) \({dy\over dx}+xy=0\)

(C) \({dy\over dx}+xy=e^{-y}\)

(D) \({dy\over dx}+e^{-y}=e^{-y}=0\)

Hint: 

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