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+4y−12=0 and 4x+3y−24=0 Equation of the angle bisector is given by |3x+4y−12√32+42|=|3y+4x−24√32+42| |3x+4y−125|=|3y+4x−245| |3x+4y−12|=|4x+3y−24| 3x+4y−12=4x+3y−24 ....(i) x−y=12 is the equation of one of the angle bisectors. 3x+4y−12=−4x−3y+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.