The differential equation of all lines passing through the origin is:

  1. \(\rm y=\sqrt x \dfrac {dy}{dx}\)
  2. \(\rm \dfrac {dy}{dx}=x + y\)
  3. \(\rm \dfrac{dy}{dx} = y - x\)
  4. None of these

Answer (Detailed Solution Below)

Option 4 : None of these
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Concept:

Differential Equation: A differential equation is an equation that relates one or more functions and their derivatives.

e.g. \(\rm \dfrac{dy}{dx}\) + x = 2y + 3, etc.

\(\rm \dfrac{d}{dx}x^n\) = nxn-1.

 

Calculation:

The general equation of all lines passing through the origin is y = mx, where m is a constant. Differentiating this equation with respect to x, we get:

\(\rm \dfrac{d}{dx}(y)=\dfrac{d}{dx}(mx)\)

⇒ \(\rm \dfrac{dy}{dx}=m=\dfrac{y}{x}\)

∴ The answer is none of these.

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