1) The line which passes through the origin and intersect the two lines x−12=y+34=z−53, x−42=y+33=z−144 is A) x1=y−3=z5 B) x−1=y3=z5 C) x1=y3=z−5 D) x1=y4=z−5 Answer: Option AExplanation:Let the line be xa=yb=zc ...(1) If line (1) intersects with the line x−12=y+34=z−53, then |abc2434−314|=0 9a - 7b - 10c = 0 ...(2) from (1) and (2) , we have, a1=b−3=c5 .'. The line is x1=y−3=z5