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Prove that the lines x = p y + q, z = r ...

Prove that the lines `x = p y + q, z = r y + s` and `x = p’ y + q, z = r’y + s’` are perpendicular, if pp' + rr' +1=0.

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The correct Answer is:
`p p' + 1 + r r' = 0`
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