Answer:
y = 5
Step-by-step explanation:
All the sides are equal, so all the angles are equal
The angles of a triangle add to 180
180/3 = 60
Each angle is 60 degrees
8y+20 = 60
Subtract 20 from each side
8y+20-20 = 60-20
8y= 40
Divide by 8
8y/8 = 40/8
y = 5
