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The equation $a x^{2} + b y^{2} + c x + c y = 0$ represents a
pair of straight lines if

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a = 0

b = 0

a + b = 0

none of these

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detailed solution

Correct option is C

If a + b = 0, the lines are (x + y)(ax – ay + c) = 0

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The equation ax2+by2+cx+cy=0 represents apair of straight lines if

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Ready to Test Your Skills?

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The equation $a x^{2} + b y^{2} + c x + c y = 0$ represents a
pair of straight lines if