Question

x=5y-8
This is the inverse of f(x) = 5x - 8, correct?
And I need help solving for y :)

Answer 1

No..
To get the inverse of f(x) = 5x - 8, solve for x first
y = 5x - 8
5x = y + 8
x = (y + 8) /5
Now switch the y and x
y = (x + 8) /5
f(x) = (x + 8) /5 is your inverse

Answer 2

Well yes that is the first step...switching the positions of 'x' and 'y'...

so now you have

x = 5y - 8

And you want to solve for 'y' again, how would you do so?

Answer 3

I'm not sure...Math has never been my strength in school. :/

Answer 4

I'm a good learner though @johnweldon1993

Answer 5

Well you can do either this first or as BangKokGarret has posted above

If you do this the way I have...you start with

x = 5y - 8

Now use algebra to get the 'y' by itself...add 8 to both sides to isolate the 5y first

x = 5y - 8
+8 +8
-----------
x + 8 = 5y

Now you just divide everything by 5 to completely solve for 'y'

x + 8 = 5y
----------
5 5

y = x+8
----
5

Answer 6

So you got that step by dividing? Hence the fraction?

Answer 7

@johnweldon1993 thanks, I think I'm good to go. Appreciate the help.

Answer 8

Yeah dividing...just because as you see the 'y' is being multiplied by 5...so to cancel that out...you DIVIDE by 5