Question

find the inverse of the one-to-one function f(x)=4/5x-1

Answer 1

f-1(x)=4/5x+1/5 is answer on the key

Answer 2

find x in terms of f(x)
then replace f(x) by x

Answer 3

y=4/5x-1

Answer 4

x=4/5y-1

Answer 5

now im lost

Answer 6

is the right side