Answer:
Following are the solution to this question:
Explanation:
In the given question, R stands for radio, S stands for stereo, T stands for television
Since the value of Vally Mills as follows:
![11 \ R, 10 \ S, 8\ T \ per \ hour](https://img.qammunity.org/2021/formulas/mathematics/high-school/fmkvn2x83y71r40tu5d3013or46jglap3e.png)
The value of Marlin as follows:
![7 \ R,12 \ S, 8\ T \ per\ hour](https://img.qammunity.org/2021/formulas/mathematics/high-school/d7w3cgues72acv54051g6zuzqndxr8wft7.png)
The value of Hillsboro as follows:
![5 \ R, 3 \ S, 15\ T \ per\ hour](https://img.qammunity.org/2021/formulas/mathematics/high-school/ueek9bs5ij6w6wb7fp3hc5kcu5wtf32paf.png)
Take into account x1-Vally hour Mills, x2-Marlin hours, x3-Hillsboro hours
In point A:
![\to 1335\ R,1550\ S,1850\ T](https://img.qammunity.org/2021/formulas/mathematics/high-school/g47wt1pbfg14k9oot6iqwqn1vcwiedc5ox.png)
calculate the above equations as follows:
![\to 11 x_1 + 7x_2 +5x_3 =1335\\\to 10x_1 +12x_2 +3x_3 = 1550\\\to 8x_1 +8x_2 +15 x_3 =1850\\](https://img.qammunity.org/2021/formulas/mathematics/high-school/qs8c66a2nz8yivbewam3me0idtdet28iew.png)
In point B:
![\to 1045 \ R, 1220\ S,1470 \ T\\\\](https://img.qammunity.org/2021/formulas/mathematics/high-school/wqdp95orhq7fd70m9uj71zmrmtw01osfiz.png)
calculate the above equations as follows:
![\to 11x_1 +7x_2 +5x_3 =1045\\\to 10x_1 +12x_2 +3 x_3 =1220\\\to 8x_1 +8 x_2 +15 x_3 =1470](https://img.qammunity.org/2021/formulas/mathematics/high-school/yn74khvlgxorowwr9eig84u0fjzrvy97is.png)
Equations are rendered there