1.

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

Answer»

`AA' + ALPHA =1`
`(a)/( a') + (C )/( c') = -1`
`(a)/( a') + ( c )/( c') =1`
`aa'+ c c'=-1`

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