Aspire Faculty ID #16446 · Topic: NIMCET 2009 · Just now
NIMCET 2009

The straight lines $\dfrac{x}{a} + \dfrac{y}{b} = k$ and $\dfrac{x}{a} + \dfrac{y}{b} = \dfrac{1}{k}$ (with $k\neq0$) meet on:

Solution

Intersection point $(x,y)$ satisfies: 
$\dfrac{x}{a} + \dfrac{y}{b} = k$ 
$\dfrac{x}{a} + \dfrac{y}{b} = \dfrac{1}{k}$
Subtract → inconsistent unless the meeting point satisfies: Multiply equations:  $\left(\dfrac{x}{a} + \dfrac{y}{b}\right)\left(\dfrac{x}{a} + \dfrac{y}{b}\right) = 1$ 
Thus locus: $\left(\dfrac{x}{a} + \dfrac{y}{b}\right)^2 = 1$ 
This is a pair of parallel lines (degenerate hyperbola) → classified as hyperbola.

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