Pedro and André went on a tour driving to Luxor and Aswan and took turns driving; each day Pedro drove for at least 4 hours and NO more than 8 hours, while André drove at least 2 hours and less than 7 hours. The total time they drove daily was NO more than 9 hours. State the system of inequalities that describes the situation, using to represent the number of hours that Pedro drove and to represent the number of hours that André drove.
A shepherd wants to build a rectangular sheep barn. The length of the barn must be more than 88 m and its perimeter must be less than 253 m. Derive the system of inequalities that describes the situation, denoting the length of the barn by and its width by .