Answer:

<CEF = 90°

z+50° = 90°

z = 90°-50°

z = 40°

AB||EF

z= x (alternate interior angle

x = 40°

AB|| CD and BD is a transversal.

x + y = 180°(sum of co-interior angle)

40°+y = 180°

y = 180°40°

y = 140°

Step-by-step explanation:

I hope it will help u.