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The differential equation $\dfrac{dy}{dx} + P(x) y = Q(x)$ (with $P, Q$ functions of $x$) is called:
AVariables separable
BHomogeneous
CLinear differential equation of first order
DExact differential equation
Answer & Solution
Correct answer: C. Linear differential equation of first order
Standard form of a linear first-order DE in $y$: $dy/dx + Py = Q$. Solved using the integrating factor $e^{\int P\,dx}$.
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