1.

To find the condition that the three straight lines A_(1)x+B_(1)y+C_(1)=0, A_(2)x+B_(2)y+C_(2)=0 and A_(3)x+B_(3)y+C_(3)=0 are concurrent.

Answer»


ANSWER :`rArrA_(3)(B_(1)C_(2)-B_(2)C_(1))+B_(3)(C_(1)A_(2)-C_(2)A_(1))+C_(3)(A_(1)B_(2)-A_(2)B_(1))=0`


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