A) \[(a,b)\]
B) \[(b,a)\]
C) \[(-a,-b)\]
D) None of these
Correct Answer: A
Solution :
The three lines are concurrent. if \[\left| \,\begin{matrix} 1 & 2 & -9 \\ 3 & 5 & -5 \\ a & b & -1 \\ \end{matrix}\, \right|=0\] \[\Rightarrow 35a-22b+1=0\] which is true if the line \[35x-22y+1=0\] passes through (a, b).
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