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MArishka [77]
1 year ago
6

…………..HELP……………………………..

Mathematics
1 answer:
stich3 [128]1 year ago
4 0

Answer:

C

Step-by-step explanation:

Let f(y)=x.

x=\frac{1}{3}-\frac{1}{21}y \\ \\ x-\frac{1}{3}=-\frac{1}{21}y \\ \\ y=-21x+7 \\ \\ f^{-1}(x)=-21x+7

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