$9$ Using PowerWorld case Example $6\_22$ with the Load Scalar equal to $1\mathrm{.}0,$ determine the generation dispatch that minimizes system losses $($Hint: Manually vary the generation at buses $2$ and $4$ until their loss sensitivity values are zero$).$ Compare the operating cost between this solution and the Example $6\_22$ economic dispatch result. Which is better? $6\mathrm{.}70$ Repeat Problem $6\mathrm{.}69,$ except with the Load Scalar equal to $1\mathrm{.}4.$