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The two lines x = ay+ b , z = cy + d and...

The two lines `x = ay+ b , z = cy + d and x = a' y + b', z = c ' y + d'` will be perpendicular, if and only if

A

`aa' + bb' + c c' + 1=0`

B

` aa' +bb' +c c=0`

C

`(a + a ') (b + b') (c + c'') =0`

D

`aa ' + c c' +1=0`

Text Solution

Verified by Experts

The correct Answer is:
D
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