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JEE MATHEMATICS MCQ: STRAIGHT LINES

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Application +4 | -1
If the lines x+3y−9=0,  4x+by−2=0x + 3y - 9 = 0,\;4x + by - 2 = 0 and 2x−y−4=02x - y - 4 = 0 are concurrent, then b equals
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Correct option: A
-5
Option A (-5) is correct because the determinant of the coefficients must be zero for concurrent lines.

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