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Question

Assertion :Each point on the line y−x+12=0is equidistant from the lines 4y+3x−12=0, 3y+4x−24=0 Reason: The locus of a point which is equidistant from two given lines is the angular bisector of the two lines.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The straight line equidistant from a pair of straight lines is the angle bisector of the angle between the straight lines.
Hence, consider the equations 3x+4y12=0 and 4x+3y24=0
Equation of the angle bisector is given by
|3x+4y1232+42|=|3y+4x2432+42|
|3x+4y125|=|3y+4x245|
|3x+4y12|=|4x+3y24|
3x+4y12=4x+3y24 ....(i)
xy=12 is the equation of one of the angle bisectors.
3x+4y12=4x3y+24
7x+7y=12 ...(ii) is the equation of the second angle bisector.
both assertion and reasons are true, and the reason is the correct explanation of the assertion.

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