## anonymous one year ago If f(x) = 1/9x - 2 , what is f–1(x)?

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1. Nnesha

is it $\huge\rm \frac{ 1 }{ 9x-2 } ~~~or~~\frac{ 1 }{ 9x}-2$

2. Nnesha

??

3. anonymous

1/9x + 2 is one of the answer

4. Nnesha

no i'm asking which one is your question first one or 2nd ?is it $\huge\rm \frac{ 1 }{ 9x-2 } ~~~or~~\frac{ 1 }{ 9x}-2$

5. anonymous

Oh, the second one.

6. Nnesha

alright so to find inverse switch y and x variable f(x) is same as y so $\huge\rm \color{reD}{y}=\frac{ 1 }{ 9\color{blue}{x} }-2$ inverse would be $\huge\rm\color{blue}{x}=\frac{ 1}{ 9\color{ReD}{y}}-2$ now solve for y

7. Nnesha

do you know how to solve that equation for y?

8. anonymous

y = 1/9(x+ 2) ?|dw:1441813061513:dw|

9. anonymous

Is that right ?

10. Nnesha

can you plz explain how u got that answer ?:=)

11. anonymous

I kept y on one side and moved everything else to x

12. Nnesha

haha, nice good!!