Q26 / 75 · JEE Main 2020 (04 Sep Shift 2) · Mathematics

The circle passing through the intersection of the circles, x2+y2-6x=0 and x2+y2-4y=0 having its centre on the line, 2x-3y+12=0, also passes through the point :

  • A
    (–1,3)
  • Correct answer
    B
    (–3,6)
  • C
    (–3,1)
  • D
    (1,–3)

Solution

By family of circle, circle passing through intersection of given circles will be member of

S1+λS2=0 family (λ≠1)

x2+y2-6x+λx2+y2-4y=0

(λ+1)x2+(λ+1)y2-6x-4λy=0

x2+y2-6λ+1x-4λλ+1y=0

 Centre 3λ+1,2λλ+1

Centre lies on 2x-3y+12=0

23λ+1-32λλ+1+12=0

6λ+18=0

λ=-3

Now circle is:x2+y2+3x-6y=0

Now check each option

Hence, the correct answer is option: 'B'.

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