A) 0
B) 1
C) 3
D) 7
Correct Answer: A
Solution :
If given lines are concurrent, then \[\left| \begin{matrix} 4 & 3 & -1 \\ -1 & 1 & -5 \\ k & 5 & -1 \\ \end{matrix} \right|=0\] \[\Rightarrow \] \[4(-1+25)-3(1+5k)-1(-5-k)=0\] \[\Rightarrow \] \[96-3-15k+5+k=0\] \[\Rightarrow \] \[-14k+98=0\] \[\Rightarrow \] \[k=7\]You need to login to perform this action.
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