P,Q,R and S are four points with the position vectors, 3→i−4→j+5→k,4→k,−4→i+5→j+→k and −3→i+4→j+3→k respectively. Then the line PQ meets the line RS at the point
−3→i+4→j+3→k
Equation of PQ:x3=y−4=z−41a point A on PQ=(3λ,−4λ,λ+4)Equation of RSx+41=y−5−1=z−12=ma point on RS, B=(m−4,m+5,2m+1)to intersect A = B⇒λ=−1,m=1∴Point is (−3,4,3)