1.

Prove that if the lines x = ay + b, z = cy + d and x = a'y + b', z = c'y + d' are perpendiclar to each other aa' + cc' + 1 = 0.

Answer»

`ac_1 + a_1 c = 1`
`"aa"_1 + "cc"_1 + 1 = 0`
`bc_1 + b_1c + 1 =0`
NONE of these

Answer :B


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