SOLUTION: Please help me solve the equation, f(x) = 2x-5 divided by x+4, find f-1(x). This is a problem which the teacher created from this section of the book. Thank you for your help and

Question 140634: Please help me solve the equation, f(x) = 2x-5 divided by x+4, find f-1(x). This is a problem which the teacher created from this section of the book. Thank you for your help and assistance. Gary
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
f(x) = 2x-5 divided by x+4, find f-1(x).
:
f(x) = y
:
y =
solve for x:
Multiply both sides by (x+4)
2x - 5 = y(x+4)
2x - 5 = xy + 4y
2x = xy + 4y + 5
2x - xy = 4y + 5
x(2-y) = 4y + 5
x =

:
To find the inverse, swap x and y:
y =
f-1(x) =

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