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Two Point Form of a Line

If the sum of...

Question

If the sum of the slopes of the lines represented by the equation $x^{2} - 2 x y t a n A - y^{2} = 0$ be 4, then $∠ A$ =

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Solution

The correct option is D

$m_{1} + m_{2} = \frac{2 t a n A}{- 1} = 4$

$\Rightarrow t a n A = - 2 \Rightarrow ∠ A = t a n^{- 1} (- 2)$ .

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