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Pair of Straight Lines

If separate equation of two lines be ax + by + c = 0 and a1x + b1y + c1 = 0, then their joint equation will be (ax + by + c) (a1x + b1y + c1) = 0.


Note: In order to find the joint equation of two lines makes RHS of equation of straight lines equal to zero and then multiply the two equations.

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