Which of the following pairs of lines are per- pendicular? (a) x = 2 + 2t y = −3 − 3t z = 4 + 4t and x = 2 + t y = 4 − t z = 5 − t (b) x = 3 − t y = 4 + 4t z = 2 + 2t and x = 2t y = 3 − 2t z = 4 + 2t

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Q: If u=2x+y and v=x-2y then the st ream line is y2 x2 2ху+ 2 صواب ihi

A: Thanks for the question :)And your upvote will be really appreciable ;)