Answer:
b + e = 180°
Step-by-step explanation:
lines x and y are parallel. Therefor angles b and c are allied angles. That means;
b + c = 180°
Furthermore, angle c = angle e. (they're vertically opposite angles)
b + c = 180° (Proved above)
c = e (Proved above)
∴ b + e = 180°
