Answer:
y = 25
Step-by-step explanation:
Since AE and BC are parallel, then
∠AED = ∠BCE = 110° ( corresponding angles )
Since EF is the angle bisector of ∠AED, then
∠AEF = ∠FED = 55°
∠AFE and ∠DFE form a straight angle, thus
∠AFE = 180° - 80° = 100°
The sum of the angles in ΔAEF = 180°, thus
y = 180 - (55 + 100) = 180 - 155 = 25
