algebra

How do I find out if x-1 is a function
---
3

and does x-1 1 1
--- =y = - - - =y
3 3x 3

oh sorry, it came all weird when i typed it out

can you just answer me this?

how do i find out if (x-1)/3 is a function?

oh, and sorry, the name's wrong because I used my sister's account

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