1.

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

Answer»

`aa' + BB' + C c' + 1=0`
` aa' +bb' +c c=0`
`(a + a ') (B + b') (c + c'') =0`
`aa ' + c c' +1=0`

ANSWER :D


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