Item 4 the triangular region shows the number of possible ounces of platinum, x, and the number of possible ounces of silver, y, a jewelry maker can mix together to make a certain piece of jewelry. which combination of platinum and silver can the jewelry maker use? 16 oz of platinum and 30 oz of silver 25 oz of platinum and 20 oz of silver 10 oz of platinum and 10 oz of silver 12 oz of platinum and 20 oz of silver