Question
Mathematics Question on Straight lines
The angle between the straight lines x−y3=5 and 3x+y=7 is
A
(A) 90o
B
(B) 60o
C
(C) 75o
D
(D) 30o
Answer
(A) 90o
Explanation
Solution
Explanation:
Given, equations of straight lines arex−y3=5 and 3x+y=7On comparing with ax+by=0, we geta1=1,b1=−3,a2=3,b2=1Now, a1a2+b1b2=1⋅3+(−3)⋅1=0∴ Lines are perpendicular.∴θ=90∘