A is the correct answer i'm pretty sure
Answer:
4
Step-by-step explanation:
Y-9 + y/2 = 180
Add nine to each side
y+y/2=189
Multiply each side by two
2y+y=378
Add the y's together
3y=378
Divide it all by three
y=126
so, Angle B is 126 degrees
I hope that helps!
I think this system is consistent and dependent
1st,2nd,3rd,4th that is your answer
