Verified Answer :

Make the function, f (x) into y. Then switch the variables y and x and solve for y : (x-4)/5

apologiabiology

the inverse is the reflection across the identiy line, the y=x line

basically
switch x and y and solve for y

f(x)=5x+4
y=5x+4
swtich
x=5y+4
solve for y
x-4=5y
(x-4)/5=y

finverse=(x-4)/5

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