The angle between the pair of straight lines x 2 − y 2 − 2 y − 1 = 0 , is Options: A . &nbsp90∘ B . &nbsp60∘ C . &nbsp75∘ D . &nbsp36∘

The angle between the pair of straight lines x2−y2−2y−1=0,

Question

The angle between the pair of straight lines

x^{2} - y^{2} - 2 y - 1 = 0

, is

Options:

A . 90∘

B . 60∘

C . 75∘

D . 36∘

Answer: Option A
:
A
Pair of straight lines represented by a second degree equation with coefficient of

x^{2}

as a and coefficient of

y^{2}

as bare perpendicular if a+b = 0
Here a + b = 0,so they are perpendicular to each other

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