Answer:
To resolve the stated issue, we will make use of the triangle's external property.
According to the triangle's external property, a triangle's exterior angle equals the sum of its two opposite inner angles.
Given:
A 50-degree angle is opposite a 120-degree external angle.
x+50=120
x=120-50
x=70
Also the sum of all angles of a triangle is 180
x+y+50=180
70+y+50=180
y=180-70-50
y=180-120
y=60
So, value of y is 60 degree and x is 70 degree.