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Michelle has $12 and wants to buy a combination of dog food to feed at least three dogs at the animal shelter. A serving of dry food costs $1, and a serving of wet food costs $4. (please organize your answer)

Part A: Write the system of inequalities that models this scenario.

Part B: Describe the graph of the system of inequalities, including shading and the types of lines graphed. Provide a description of the solution set.