First slide

Pair of straight lines

Question

If the line $y = 3 x$ bisects the angle between the lines $a x^{2} + 2 a x y + y^{2} = 0$ , then 11a =

Moderate

Solution

Put $y = 3 x$ in $h (x^{2} - y^{2}) = (a - b) x y$

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