106OR
u can use .
cramers rule
det = 0 and individual dets (D1, D2, D3)= 0
sorry if i sound ambiguous .. its just dat ive lost track of what the names of things r.
4 Answers
29For the abv eqns ..the cross product of their normals of the planes..give the direction ratios of the line passing through them..
for it to be a single line..
drs of the line passing through 3x - y - 2z = 0 and x - y + 2z = 0 is (1,4,1)
drs of the line passing through x - y + 2z = 0 and x + y -kz = 0 is (k-2, k+2, 2)
comparing the drs of the two lines K = 6
so ans is D
106