The length of the perpendicular from the point $(b, a)$ to the line $\frac{x}{a} - \frac{y}{b} = 1$ is:

  • A
    $\left| \frac{a^2 - ab + b^2}{\sqrt{a^2 + b^2}} \right|$
  • B
    $\left| \frac{b^2 - ab - a^2}{\sqrt{a^2 + b^2}} \right|$
  • C
    $\left| \frac{a^2 + ab - b^2}{\sqrt{a^2 + b^2}} \right|$
  • D
    None of these

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Find the points on the $x$-axis,whose distances from the line $\frac{x}{3}+\frac{y}{4}=1$ are $4$ units.

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