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Two pairs of straight lines have the equations `y^2+x y-12 x^2=0` and `a x^2+2h x y+b y^2=0` . One line will be common among them if. `a+8h-16 b=0` (b) `a-8h+16 b=0` `a-6h+9b=0` (d) `a+6h+9b=0`

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CENGAGE PUBLICATION-STRAIGHT LINES-All Questions
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