# 1-1 inverse functions

1. Mar 21, 2010

### steve snash

1. The problem statement, all variables and given/known data
f(22)=9 and f^-1(13)=7

find f^-1(9) and f(7)

(given that these are 1-1 functions)

2. Relevant equations
What does this mean as the have not given the equations they used to find the values, i know inverse function is the function that can find the opposite of the original function.

3. The attempt at a solution
Can someone help me see how to start to work out this problem??

2. Mar 21, 2010

### rock.freak667

If a function f maps x onto y, then what should the inverse function do?

3. Mar 21, 2010

### steve snash

map y onto x, but what does that mean

4. Mar 21, 2010

### rock.freak667

In the first case f(22)=9, this means that the function f, maps 22 to 9.

then f-1(9), means the function f-1 maps 9 onto ?

5. Mar 22, 2010

### icystrike

What does it mean by $$f^{-1}[f(x)]$$ or $$f[f^{-1}(x)]$$ it simply means to tie your shoelace and undo it .. or vice versa.