If non-zero numbers $a, b, c$ are in H.P., then the straight line $\frac{x}{a}+\frac{y}{b}+\frac{1}{c}=0$…

If non-zero numbers $a, b, c$ are in H.P., then the straight line $\frac{x}{a}+\frac{y}{b}+\frac{1}{c}=0$ always passes through a fixed point. That point is
  1. $(-1,2)$
  2. $(-1,-2)$
  3. $(1,-2)$
  4. $\left(1,-\frac{1}{2}\right)$

Solution

a, b, c are in H.P. $ \begin{aligned} & \Rightarrow \frac{2}{b}-\frac{1}{a}-\frac{1}{c}=0 \\ & \frac{x}{a}+\frac{y}{b}+\frac{1}{c}=0 \\ & \Rightarrow \frac{x}{-1} \quad-\frac{1}{-1} \quad \therefore x=1, y=-2 \end{aligned} $

Asked in: JEE Main 2005

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