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## anonymous 4 years ago write an equation for the inverse f(x)= x-7 ----- 2

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1. anonymous

what do you mean by mutliply both sides by 2?

2. TuringTest

1) rename f(x) and call it y 2) multiply both sides by 2 3) add 7 to both sides 4) switch the places of x and y 5) rename y f^(-1)(x) multiply both sides by 2 is like so: x=y/2 2x=y

3. anonymous

so the answer wouldnt be y=2x-14/4 after i multpily both sides by 2?

4. TuringTest

no, the 2's on the right cancel you also forgot to multiply the right side:$y=\frac{x-7}2$$2y=x-7$now continue with the rest of the steps

5. TuringTest

I meant you forgot to multiply the left side*

6. anonymous

okay so now i add 7 to -7 and x right? or to the 2y? im so confused on this stuff!

7. TuringTest

you add it to /both/ sides in an equation, if you do something to one side you must always do it to the other as well, or else the two sides won't be equal anymore

8. anonymous

alright, that makes sense.

9. TuringTest

good :D so go ahead and give it a try

10. anonymous

somehow, i got 9x=y

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