I'LL MARK BRAINLIEST !!!
1 answer:
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Answer:
second option
Step-by-step explanation:
let y = f(x) and rearrange making x the subject, that is
y = x - 9 ( add 9 to both sides
y + 9 = x
Change y back into terms of x with x = (x) , then
(x) = x + 9