finite business math

Formulate but do not solve the following exercise as a linear programming problem. Perth Mining Company operates two mines for the purpose of extracting gold and silver. The Saddle Mine costs $13,000/ day to operate, and it yields 45oz of gold and 3,000oz of silver each of x days. The Horseshoe Mine costs $18,000/ day to operate, and it yields 80oz of gold and 1,500oz of silver each of y days. Company management has set a target of at least 600 oz of gold and 19,000 oz of silver. How many days should each mine be operated so that the target can be met at a minimum cost C in dollars? Minimize C= subject to the constraints gold silver x0y0