Answer:
x = 150 degrees
Explanation:
A straight line always have 180 degrees.
In this case, y is a supplementary angle, two angles that add up to 180
80 + y = 180
y = 100 degrees
A quadrilateral always have 360 degrees.
So:
60 + 50 + 100 + x = 360
210 + x = 360
x = 150