Question

I challenge you to answer this. Nobody can do it so far!

Answer 1

what do you challenge me?

Answer 2

If you have a function y=(b*x-a)/(a+c*x)
Can you find a value for x if y is given?

Answer 3

x= a*(y+1)/(-c*y+b)

Answer 4

a= -3,516995576918316
b= 0,18734459582847
c= -0,0144436993225714
y=33.6

Answer 5

checking... it should be around 55

Answer 6

You want me to find x, given that y?

Answer 7

I calculated by your formula and its not correct

Answer 8

do you agree that, using your a,b,c
x = -3.516995576918316*(y+1)/(0.0144436993225714*y+.18734459582847)

Answer 9

i cant fit that in one line

Answer 10

Here is the graph

Answer 11

$$ x = \frac{-3.516995576918316*(y+1)}{(0.0144436993225714*y+.18734459582847)}$$

Answer 12

do you agree with that
then i plug in y = 33.6

Answer 13

wait a sec

Answer 14

what did u get? It must be around 55

Answer 15

I got -180

Answer 16

did u look the graph?

Answer 17

yes, what are you graphing

Answer 18

Viscosity of shugar disolved in vater

Answer 19

you're fitting a quadratic curve to the data?

Answer 20

the curve is \( y = ax^2 + bx + c \)

Answer 21

PS its 3 in the morning here and im going insane

Answer 22

$$ y = -3.516995576918316x^2 + 0.18734459582847x -0.0144436993225714$$

Answer 23

Let's round, we don't need so many decimals. 4 decimal places should be sufficient
$$ \large y = -3.517x^2 + 0.1873x -0.0144$$

Answer 24

I just need to find an x with given y.... thats all

Answer 25

do you have the original data

Answer 26

yes, but would you understand it?

Answer 27

if you tell me what is the independent variable, dependent variable

Answer 28

If I can see how you got that equation, I can solve for y.

Answer 29

http://mathforum.org/dr.math/

Answer 30

here is a graphical solution - it doesn't match your estimate of 55 for a solution though

Answer 31

It does confirm the ~ -180 value that @owen3 got

Answer 32

but how can it be -180? look at my graph

Answer 33

\[x = \dfrac{a(y+1)}{b-cy}\]

http://www.wolframalpha.com/input/?i=isolate+x,++y%3D%28b*x-a%29%2F%28a%2Bc*x%29

Answer 34

@PhisicsStudent

As far as I see your graph is not the graph of the equation you wrote.

I used Desmos Graphing page to plot the equation you wrote, using the values of a,b &c you gave.

The resulting graph is in my previous post - it is not a continuous curve like you drew