Find the answer of equation

Question

If the point (8, 2)

is on the graph of the function f, then the point (x, y) =

 

 

 is on the graph of f ⁻¹.

Answer 1

If f(a) = b, then f^-1(b) = a

In other words, if (a,b) is on the graph of y = f(x), then (b,a) is on the graph of y = f^-1(x).

So, since (8,2) is on the graph of y = f(x), (2,8) is on the graph of y = f^-1(x).