The cat food manufacturer utilizes fish and beef by-products. The fish has 12g of protein and 3g of fat per ounce. The beef has 6g of protein and 9g of fat per ounce. Every can of cat food should contain at least 60g of protein and 45g of fat. Determine system of inequalities which explains possible number of ounces of fish and beef which can be utilized in each can to satisfy seminimum needs. Graph solution set.