Pair Of Straight Lines Question 89

Question: The straight lines represented by the equation $ 9x^{2}-12xy+4y^{2}=0 $ are

Options:

A) Coincident

B) Perpendicular

C) Parallel

D) Inclined at an angle of $ 45^{o} $

Show Answer

Answer:

Correct Answer: A

Solution:

Since $ h^{2}-ab $ i.e., $ {{(6)}^{2}}-9\times 4=0 $