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))`


Discussion

No Comment Found

Related InterviewSolutions