Re: y = (ax + b)/(cx+d)

If You say that
y(x)=m*(x-r1)/(x-r2);
then r1 = .99994410454961, r2 = .99984615540355, m = 21.301499194736 gives
y(x) = 21.301499194736*(x-.99994410454961)/(x-.99984615540355) and
has minimium value for sum ((Measured(y(x))-y(x))^2.
However
y(x)=-3.9287499997661*(x+.70886726384838e-3)*(x-76.302649690877)/(x+37.249999999108)
fits the points perfectly.

Chris

patrick wrote:

Hello,

I'm trying to solve a problem of the kind:

y = (ax + b)/(cx+d)

Here are some measures for x and y:

7.74 = (a(1)+b)/(c(1)+d)
14.88 = (a(2)+b)/(c(2)+d)
21.47 = (a(3)+b)/(c(3)+d)
27.55 = (a(4)+b)/(c(4)+d)

Is it possible to solve a, b, c and d?

Kind regards and thanks...

Patrick
.

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