Answer:
C. 60°
Step-by-step explanation:
To answer this problem we must make use of the sum of the internal angles of a triangle.
For any triangle the sum of its internal angles is equal to 180 °.
So we must add all the angles to find the answer:
[tex]y+y+60=180[/tex]
now we can add the two terms 'y'
[tex]2y+60=180[/tex]
and now we clear for 'y':
[tex]2y=180-60\\2y=120\\y=120/2\\y=60[/tex]
The value of y is 60°
