The lines `a_(1)x + b_(1)y + c_(1) = 0` and `a_(2)x + b_(2)y + c_(2) = 0` are perpendicular to each other , then `"_______"`.

The lines `a_(1)x + b_(1)y + c_(1) = 0` and `a_(2)x + b_(2)y + c_(2) =

1.	The lines `a_(1)x + b_(1)y + c_(1) = 0` and `a_(2)x + b_(2)y + c_(2) = 0` are perpendicular to each other , then `"_______"`.
Answer» Correct Answer - `a_(1) a_(2) + b_(1) b_(2) = 0`

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