When the treasury bill rate is $0\mathrm{.}4\%,$ and the return on the S&P $500$ index is $7\mathrm{.}7\%$ per year. The Beta for Walmart stock is $0\mathrm{.}19.$ Please

Draw the expected return of the Walmart stock on this diagram BELOW based on the security market line $($SML$).$

Write down the equation of the Walmart stock based on SML$.$