[MP PET 1999]
A) $ 15^{o} $
B) $ 45^{o} $
C) $ 75^{o} $
D) $ 90^{o} $
Correct Answer: D
Coefficient of $ x^{2} $ + Coefficient of $ y^{2} $
$ =1-1=0 $ \ Lines are perpendicular to each other.
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