Let f(x) = 7x - 13. Find f-1(x). this stuff is really confusing me plz help

Question

anonymous · Answer

f(x) = y = 7x - 13
you should change it to x=something!

anonymous · Answer

how would i do that im just starting this stuff for my sofmore year so im really new at it

anonymous · Answer

y = 7x - 13
y + 13 = 7x
(y + 13)/7 = x
f^-1(x) = (x + 13) / 7

it's clear or need explain? ;)

anonymous · Answer

so i would solve (x+13)/7?

anonymous · Answer

do you agree with this 
$$f(a) = b \rightarrow  f^-1(b) = a$$

anonymous · Answer

yea

anonymous · Answer

now$$f(x) = 7x - 13$$and we know$$f ^{-1}(7x - 13) = x$$now for found f inverse we do this$$f(x) = y = 7x - 13 \rightarrow y+13 = 7x \rightarrow \frac{ y+13 }{ 7 }=x$$now just relocation x and y$$\frac{ x+13 }{ 7 }=y=f ^{-1}(x)$$