Q35 / 109 · NTA Abhyas (JEE Main) 2020 · Mathematics · Straight Lines

The point A divides the line segment joining the points (-5,1) and (3,5) in the ratio k:1 internally and the coordinates of points B and C are 1,5 and 7,-2 respectively. If the area of ∆ABC is 2 sq. units, then the sum of all the values of k is equal to

  • A
    329
  • B
    7
  • Correct answer
    C
    949
  • D
    319

Solution

A≡3k-5k+1,5k+1k+1
Area of ∆ABC=2 sq.units
⇒123k-5k+15+2+1-2-5k+1k+1+75k+1k+1-5=±2
⇒14k-66=±4k+1⇒k=7 or 319

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

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