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The standard form of a first-order linear differential equation is:
A$\dfrac{dy}{dx} = Py$
B$y\dfrac{dy}{dx} = Q$
C$\dfrac{dy}{dx} + Py = Q$
D$\dfrac{d^2y}{dx^2} + Py = Q$
Answer & Solution
Correct answer: C. $\dfrac{dy}{dx} + Py = Q$
A first-order linear DE is written dy/dx + Py = Q, with P, Q functions of x.
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