Given the power function y = f (x), the image passes through the point (9, one third) to find the value of F (36)

Given the power function y = f (x), the image passes through the point (9, one third) to find the value of F (36)

y=x^a
9^a=1/3
a=-1/2
y=x^(-1/2)
f(36)=36^(-1/2)=1/6