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Question
The angle between the pair of straight lines x2−y2−2y−1=0, is
The angle between the pair of straight lines x2−y2−2y−1=0, is
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Solution
The correct option is A
Pair of straight lines represented by a second degree equation with coefficient of x2 as a and coefficient of y2 as b are perpendicular if a+b = 0
Here a + b = 0, so they are perpendicular to each other
Pair of straight lines represented by a second degree equation with coefficient of x2 as a and coefficient of y2 as b are perpendicular if a+b = 0
Here a + b = 0, so they are perpendicular to each other