The blue region consists on the intersection of two regions. The region above the decreasing line, and the region below the increasing line. Those lines are
![\begin{cases}y=x+8 \\ y=-(1)/(2)x\end{cases}](https://img.qammunity.org/2023/formulas/mathematics/college/n9qmtx3mbqwwt1oanw363bvy7ft67kr5zq.png)
Those are the boundaries of those regions. Since both lines are dashed lines, the regions do not include those lines. The increasing line is the one with the positive slope
![y=x+8](https://img.qammunity.org/2023/formulas/mathematics/high-school/oi0be2s202aqs4rdhrgcqgg5oklor43g.png)
Since our region is below this line, the y values must be less than the values on this line, and the inequality that represents this region is
![yThe decreasing line is the one with the negative slope[tex]y=-(1)/(2)x](https://img.qammunity.org/2023/formulas/mathematics/college/dy4dtgstk5akupmd3gbgv42mkb7qh38wh1.png)
Since our region is above this line, the y values must be greater than the values on this line, and the inequality that represents this region is
![y>-(1)/(2)x](https://img.qammunity.org/2023/formulas/mathematics/college/oj1gbql8es6n8n9cq1crklf3eu4xbxvvb1.png)
Combining those two regions, we have their intersection which is the desired blue region
![y-(1)/(2)x](https://img.qammunity.org/2023/formulas/mathematics/college/q7ffnu0rtm2v5tqm5tt3ubp0l5pvvqm40g.png)