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Angle between Two Lines

What are repr...

Question

What are represented by the equation $x y + a^{2} = a (x + y) .$

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Solution

Given equation
$x y + a^{2} = a x + a y$
$x y - a x - a y + a^{2} = 0$
$x (y - a) - a (y - a) = 0$
$(x - a) (y - a) = 0$
Hence the equation represents pair of straight lines

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