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

The two lines `x=ay+b,z=cy+d and x=a'y+b', z=c'y +d'` are pendicular to each other if

A

`aa'+ c c'=1`

B

`(a)/(a')+(c)/(c')=-1`

C

`(a)/(a')+(c)/(c')=-1`

D

`aa'+ c c'=-1`

Text Solution

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The correct Answer is:
(d)
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