Let PQR be a right angled isosceles triangle, right angled at P (2, 1). If the equation of the line QR is 2x+y=3, then the equation representing the pair of lines PQ and PR is [JEE 1999]
(A) 3x2−3y2+8xy+20x+10y+25=0
(B) 3x2−3y2+8xy−20x−10y+25=0
(C) 3x2−3y2+8xy+10x+15y+20=0
(D) 3x2−3y2−8xy−10x−15y−20=0