Answer:
y=9
Step-by-step explanation:
y^2=18y-81
y^2-18y+81=0
y^2-9y-9y+81=0
y(y-9)-9(y-9)=0
(y-9)(y-9)=0
(y-9)^2=0
So the value of y is 9
I hope it will help you:)
