NEED HELP WITH THIS ONE-TO-ONE FUNCTION MATH PROBLEM (PIC INSERTED)

Question

anonymous · Answer

attachment

anonymous · Answer

any vertical parabola is not a one-to-one function.

anonymous · Answer

click my attatchment

anonymous · Answer

just look at the question

anonymous · Answer

yes, it is a concave downward parabola.

anonymous · Answer

hmmm

anonymous · Answer

so what do i do??

anonymous · Answer

first i have to put the inverse of this equation , so do i just flip around the numerator and denominator?

anonymous · Answer

o pellet i posted the wrong question

anonymous · Answer

lemme post the right one

anonymous · Answer

why do you need to do that?
it just comes from the definition of on-to-one function.

anonymous · Answer

attachment

anonymous · Answer

ohk, fine..i get it
first of all, find the inverse of the function.

anonymous · Answer

okay, and do i do that by just swapping the numerator and denominator

anonymous · Answer

or switching the signs ... or both?

anonymous · Answer

$$y=\frac{ x }{ -4-9x }$$
the above equation is y in terms of x.
solve for x in terms of y.

anonymous · Answer

|dw:1372883553944:dw|
now interchange x and y.
what do you get?