How do I calculate/(what is) the K value in a pseudo first order reaction for each bleach concentration used? The rate l

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How do I calculate/(what is) the K value in a pseudo
first order reaction for each bleach concentration used?
The rate law is Rate=k[bleach][dye]. Initial dye concentration
is: 3.40x10-5M. I have bleach in concentrations of 0.090M and
0.180M.
Equation of ln(absorbance) graphs are as
follows:
9.80mL Dye with 0.20mL 0.090M Bleach : lnAbs = -4.860e-2 +
1.35e-1
9.80mL Dye with 0.20mL 0.180M Bleach : lnAbs =
-9.720e-2 + 1.35e-1
The equation of the Beers Law plot of 100%, 80%, 60%, 40%,
20%, 0% dilutions is as follows:
y=0.0117x + 0.0262