5. At the local nursey, they sold less than $1200 worth of maple and birch trees. The maple trees were sold for $65 and the birch were sold for $80. a) Define the variables and write a linear inequlaity to represent the possible combinations of trees sold. Are there any restrictions on the variables? Explain. (2 marks) b) Graph the linear inequality. (2 marks) c) Use the graph to determine if the nursery could have sold 22 birch and 15 maple trees. Explain. (2 marks)