The differential equation of the family of lines having $x$ - intercept ' $\mathrm{a}$ ' and $y$ - intercept…

The differential equation of the family of lines having $x$ - intercept ' $\mathrm{a}$ ' and $y$ - intercept ' $\mathrm{b}$ ' is
  1. $\frac{d^{2} y}{d x^{2}}=-1$
  2. $\frac{d^{2} y}{d x^{2}}=10$
  3. $\frac{d^{2} y}{d x^{2}}=1$
  4. $\frac{d^{2} y}{d x^{2}}=0$

Solution

Equation of line having $x-$ intercept $a$ and $y$ intercept $b$ is $\frac{x}{a}+\frac{y}{b}=1$ i.e. $b x+a y=a b$ Differentiating w.r.t. x, we get $\mathrm{b}+\mathrm{a} \frac{\mathrm{dy}}{\mathrm{dx}}=0 \Rightarrow \mathrm{a} \frac{\mathrm{dy}}{\mathrm{dx}}=-\mathrm{b} \Rightarrow \frac{\mathrm{dy}}{\mathrm{dx}}=\frac{-\mathrm{b}}{\mathrm{a}}$ Again differentiating w.r.t. $\mathrm{x}$, we get $\frac{d^{2} y}{d x^{2}}=0$

Asked in: MHT CET 2020 (12 Oct Shift 2)

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