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 P: 94 I'm sure what you have written is correct, I'm just having trouble getting from: $log(y_{1})=rlog(x_{1})+log(c)$ $log(y_{0})=rlog(x_{0})+log(c)$ to $r=\frac{log(\frac{y_{1}}{y_{0}})}{log(\frac{x_{1}} {x_{0}})}$ Have you done: $\log(y_0) - r\log(x_0) = \log(y_1) - r\log(x_1)$ To find r? I don't understand what you mean by interpolating, or what step you did.