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JEE Mains · Maths · STD 11 - 10.1 circle and system of circle

माना \(y=x+2,4 y=3 x+6\) तथा \(3 y=4 x+1\) वृत्त \((\mathrm{x}-\mathrm{h})^2+(\mathrm{y} \mathrm{k})^2=\mathrm{r}^2\) की तीन स्पर्श रेखाएँ हैं, तो \(\mathrm{h}+\mathrm{k}\) बराबर है :

  1. A \(5\)
  2. B \(5(1+\sqrt{2})\)
  3. C \(6\)
  4. D \(5 \sqrt{2}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(5\)

Step-by-step Solution

Detailed explanation

\(L _1: y=x+2, L_2: 4 y=3 x+6, L_3: 3 y=4 x+1\) Bisector of lines \(L _2 \& L _3\) \(\frac{4 x-3 y+1}{5}=\pm\left(\frac{3 x-4 y+6}{5}\right)\) \(\text { (+) } 4 x-3 y+1=3 x-4 y+6\) \(x+y=5\) Centre lies on Bisector of \(4 x-3 y+1=0 \&\) \(\text { (0) } 3 x-4 y+6=0\)…
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