Pair Of Straight Lines Question 99
Question: The equation to the pair of straight lines through the origin which are perpendicular to the lines $ 2x^{2}-5xy+y^{2}=0, $ is
[MP PET 1990]
Options:
A) $ 2x^{2}+5xy+y^{2}=0 $
B) $ x^{2}+2y^{2}+5xy=0 $
C) $ x^{2}-5xy+2y^{2}=0 $
D) $ 2x^{2}+y^{2}-5xy=0 $
Show Answer
Answer:
Correct Answer: B
Solution:
In this case coefficient of $ x^{2} $ and $ y^{2} $ are inter-changed and sign of h is changed.
BETA
