Derive the CAPM formula for $bar{r}_{k}-r_{f}$ by using Equation (6.9) in Chapter 6. [sum_{i=1}^{n} sigma_{i k} w_{i}=operatorname{cov}left(r_{k},
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Derive the CAPM formula for $\bar{r}_{k}-r_{f}$ by using Equation (6.9) in Chapter 6.
\[\sum_{i=1}^{n} \sigma_{i k} w_{i}=\operatorname{cov}\left(r_{k}, r_{M}\right)\]
Apply equation (6.9) both to asset $k$ and to the market itself.
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