You need at least 5 pounds of potatoes and onions. Potatoes cost $4 per pound and onions $2. You can spend at the most $18.

A. Define the variables

B. Write a system of liner inequalities that represent this situation

C. Graph the system of liner inequalities

D. Is it possible to buy 5 pounds of potatoes and 2 pounds of onions in the situation? Justify your answer