Straight Line and Pair of Straight Lines 1 Question 18

18. A straight line through a fixed point (2,3) intersects the coordinate axes at distinct points P and Q. If O is the origin and the rectangle OPRQ is completed, then the locus of R is

(2018 Main)

(a) 3x+2y=6

(b) 2x+3y=xy

(c) 3x+2y=xy

(d) 3x+2y=6xy

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Solution:

Equation of line PQ is xα+yβ=1

Since this line is passes through fixed point (2,3).

2α+3β=1

Locus of R is

2β+3α=αβ

i.e.

2y+3x=xy3x+2y=xy



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