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IF the pair of straight lines xy ...

IF the pair of straight lines ` xy - x -y +1=0` and the line ` x +ay -3=0` are concurrent then the acute angle between the pair of lines ` ax ^2 - 13 xy - 7y^2 + x + 23 y-6=0` is

A

`cos ^(-1) ((5)/(sqrt(218)))`

B

`cos^(-1)((1)/(sqrt(10)))`

C

`cos^(-1) ((5)/(sqrt(173)))`

D

`cos^(-1)((1)/(sqrt(5)))`

Text Solution

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The correct Answer is:
B
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