In a hospital ward, the patients can be grouped into two general categories depending on their condition and the amount of solid foods they require in their diet. A combination of two diets is used for solid foods because they supply essential nutrients for recovery. The following table summarizes the patient groups and their minimum daily requirements.

(a) Write the inequalities that describe how many servings of each diet are needed to provide the nutritional requirements.
(b) Graph the region determined by these constraint inequalities.

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Daily Requirement 26 oz Diet A 4 oz per serving 2 oz per serving Diet B 1 oz per serving 1 oz per serving Group 1 Group 2 18 oz