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Prove that the line x=ay+b, z=cy+d and x...

Prove that the line `x=ay+b, z=cy+d and x=a'y+b', z=dy+d'` are perpendicular if `aa'+cc'+1=0`

A

`ab' + bc' +1=0`

B

`"bb"' + cc' + 1=0`

C

`aa' + c + c'=0`

D

`"cc"' + a + a'=0`

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The correct Answer is:
C
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