CAT 2017 [slot 2] Question with solution 17

Question 51:
The points (2, 5) and (6, 3) are two end points of a diagonal of a rectangle. If the other diagonal has the equation y =3x+c,then c is
  1. -5
  2. -6
  3. -7
  4. -8
Option: 4
Explanation:

The midpoint of one diagonal lies on the other diagonal.

Midpoint is ((2+6)/2, (5+3)/2) = (4,4)
Hence 4 = 3 × 4 + c => c = -8

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