If the pairs of lines |
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b) |
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c) |
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d) |
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If the pairs of lines |
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a) |
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b) |
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c) |
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d) |
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(b)
Let be a line common to the given pairs of lines. Then
and
and
or
But for , the two pairs have both the lines common. So
and the slope
of the line common to both the pairs is 1. Now,
and
so the equation of the required lines is