The incentre of the triangle formed by lines and , is at 

a) 
b) 
c) 
d) 

The incentre of the triangle formed by lines and , is at 

a) 
b) 
c) 
d) 

(b)
Given equation of lines are
and
Incentre is on the line (Angled bisector of and )
Angle bisector of and is
and
Here, internal bisector
So, intersection point of and is
The required point of the incentre of triangle is