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Question

The locus of the point which moves in such a way that its distance from the line y=6 is always equal to 1 unit is


A

the line y=6

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B

the line y=-4

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C

x - axis

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D

the line y=-5 and the line y=-7

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Solution

The correct option is D

the line y=-5 and the line y=-7




The line y=6 is parallel to the x-axis.

We know that the locus of a point which is at a given distance from a given line, is a pair of lines parallel to the given line and at a given distance from it.

Thus, the locus of the point which moves in such a way that its distance from the line y=6 is always equal to 1 unit is a pair of lines parallel to y=6, at a distance of 1 unit from it.

Take points P and Q on y-axis, which are at a distance of 1 unit from the point where the line y=6 touches the y-axis, i.e. A.

Draw lines m and n from P and Q, parallel to the line y=6.

Thus the locus of the point which moves in such a way that its distance from the line y=6 is always equal to 1 unit are the lines y=5 and y=7.


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