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AP EAMCET · Maths · Straight Lines

Suppose \(P\) and \(Q\) lie on \(3 x+4 y-4=0\) and \(5 x-y-4=0\) respectively. If the mid-point of \(P Q\) is \((1,5)\), then the slope of the line passing through \(P\) and \(Q\) is

  1. A \(\frac{83}{35}\)
  2. B \(\frac{65}{35}\)
  3. C \(\frac{-3}{4}\)
  4. D \(\frac{3}{4}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{83}{35}\)

Step-by-step Solution

Detailed explanation

Let the line \(P Q\) be. \(y-5=m(x-1)\) ...(i) Substituting \(y=m x+5-m\) in the equation \(5 x-y-4=0\) We have, \(.5 x-m x-5+m-4=0\) \(\Rightarrow \quad(5-m) x+m-9=0\) Therefore, \(x=\frac{9-m}{5-m}\) and \(y=m\left(\frac{9-m}{5-m}\right)+5-m\) \(=\frac{25-m}{5-m}\) Here,…