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Match List-I with List-II

List-I Differential equationList-II Curve satisfying the differential equation
(A) d2ydx2+y=0\frac{d^2y}{dx^2}+y=0(I) x2+y2=Cx^2+y^2=C: Where C is an arbitrary constant
(B) dydx+y=x2+yx\frac{dy}{dx}+y=\frac{x^2+y}{x}(II) 3e−4y+4e3x=C3e^{-4y}+4e^{3x}=C: Where C is an arbitrary constant
(C) dydx+xy=0\frac{dy}{dx}+\frac{x}{y}=0(III) y=sin⁡x+cos⁡x+Cy=\sin x+\cos x+C: Where C is an arbitrary constant
(D) log⁡(dy/dx)=3x+4y\log(dy/dx)=3x+4y(IV) y=x+Cxe−xy=x+Cxe^{-x}: Where C is an arbitrary constant

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 2

(C) is variable separable: y dy=−x dxy\,dy=-x\,dx gives x2+y2=Cx^2+y^2=C.

(D) dydx=e3xe4y\frac{dy}{dx}=e^{3x}e^{4y} separates to 3e−4y+4e3x=C3e^{-4y}+4e^{3x}=C.

(B) simplifies to a linear equation whose solution is y=x+Cxe−xy=x+Cxe^{-x} (verifiable by substitution).

(A) is left with y=sin⁡x+cos⁡x+Cy=\sin x+\cos x+C.

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