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JEE Mains · Maths · STD 11 - 9. straight line

यदि रेखाओं \(y=x+1, y=4 x-8\) और \(y=m x+c\) द्वारा निर्मित त्रिभुज का लंबकेंद्र \((3,-1)\) पर है, तो \(\mathrm{m}-\mathrm{c}\) = __________

  1. A 0
  2. B -2
  3. C 4
  4. D 2
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(A) 0

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Solve line PQ & QR Point \(\mathrm{Q}\left(\frac{1-\mathrm{c}}{\mathrm{m}-1}, \frac{1-\mathrm{c}}{\mathrm{m}-1}+1\right)\) \(m_{2 H}=\frac{\frac{1-c}{m-1}+2}{\frac{1-c}{m-1}-3}=\frac{1-c+2 m-2}{1-c-3 m+3}=-\frac{1}{4}\)…
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