Answer:
Option D. w + x = z
Step-by-step explanation:
see the attached figure to better understand the problem
we have
[tex]w+x+y=180[/tex] ----> equation A
[tex]y+z=180[/tex] ----> equation B
equate equation A and equation B
[tex]w+x+y=y+z[/tex]
Subtract y both sides
[tex]w+x=z[/tex]
This equation satisfy the Triangle Exterior Angle Theorem (An exterior angle of a triangle is equal to the sum of the opposite interior angles)