Mathematics · JEE | DIFFERENTIAL EQUATIONS

Which of the following functions serves as the integrating factor for the linear differential equation \( \frac{dx}{dy} + P_1 x = Q_1 \)?

1. A
   \( e^{\int P_1 \, dx} \)
2. B
   \( e^{\int Q_1 \, dy} \)
3. C
   \( e^{\int Q_1 \, dx} \)
4. D
   \( e^{\int P_1 \, dy} \)