The law of reflection states that if the angle of incidence is 77 degrees the angle of reflection is

77 degrees

Explanation:

According to the Law of Reflection, when a ray of light strikes a surface, the angle of this ray (incident ray) with respect to the normal of the surface is equal to the angle that forms the reflected ray with the same normal of the surface.  

In other words:  

Both the incident ray and the reflected ray and the normal to the surface are in the same plane, in addition, the angle of the incident ray is equal to the angle of the reflected ray.  

In this context, if the angle of incidence is 77 degrees, the angle of reflection is 77 degrees, as well.

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6