

InterviewSolution
Saved Bookmarks
1. |
If lines `x+2y-1=0,a x+y+3=0,`and `b x-y+2=0`are concurrent, and `S`is the curve denoting the locus of `(a , b)`, then the least distance of `S`from the origin is`5/(sqrt(57))`(b) `5//sqrt(51)``5//sqrt(58)`(d) `5//sqrt(59)`A. `5//sqrt(57)`B. `5//sqrt(51)`C. `5//sqrt(58)`D. `5//sqrt(59)` |
Answer» Correct Answer - C The lines are concurrent if `|{:(1,2,-1),(a,1,3),(b,-1,2):}|=0` or 7b-3a+5=0 The locus of (a,b) is 3x-7y=5. Least distance from (0,0) = Length of perpendicular from (0,0) `=(5)/(sqrt(58))` |
|