If the sum of the slopes of the lines given by $x^{2} - 2 c x y - 7 y^{2} = 0$ is four times their product, then the value of $c$ is_____

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If the sum of the slopes of the lines given by

x^{2} - 2 c x y - 7 y^{2} = 0

is four times their product, then the value of

c

is_____

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Question Text

If the sum of the slopes of the lines given by

x^{2} - 2 c x y - 7 y^{2} = 0

is four times their product, then the value of

c

is_____

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