9.Straight Line
medium

જો સમતલમાં આવેલ લંબ રેખાઓથી બિંદુના અંતરનો સરવાળો $1$ થાય તો બિંદુના બિંદુપથનું સમીકરણ મેળવો.

A

ચોરસ

B

વર્તૂળ

C

રેખા

D

છેદતી બે રેખાઓ

(IIT-1992)

Solution

(a) Required locus of the point $(x,y)$ is the curve $|x| + |y| = 1$. If the point lies in the first quadrant, then $x > 0,y > 0$ and so $|x| + |y| = 1 \Rightarrow x + y = 1$, which is straight line $AB$. If the point $(x,\,y)$lies in second quadrant then $x < 0$, $y > 0$ and so $|x| + |y| = 1$ ==> $ – x + y = 1$

Similarly for third and fourth quadrant, the equations are $ – x – y = 1$and $x – y = 1$.
Hence the required locus is the curve consisting of the sides of the square $ABCD.$

Standard 11
Mathematics

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