Calculating Exchange Current Density, ac, and k from Tafel Curve

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Homework Statement

After plotting log(I/A) vs E/mV, you get a tafel curve. calculate the exchange current density, Io, the cathodic transfer coefficient ac and the rate constant of the reaction k.

Homework Equations

The Attempt at a Solution

Is it simply, the exchange current density is e(y intercept)

cathodic transfer coeffiecent, the gradient of the line

And then putting those two into the following quation to get K

lnI = lnIo + (1-ac) x nF/RT

Thanks for your help!

 

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I think it's ln(I/A) not log, so it's not actually a tafel curve it's a straight line.

Does this make it work?