1. (5 points) Use any method to solve the following system of equations. 3y = -5 2z = -2x Au + = 12 2. (4 points) Use a system of equations to solve the following problem. How many ounces of a 10% alcohol solution and a 15% alcohol solution must be combined to obtain 20 ounces of a 12% solution? 3. (4 points) The product of two positive integers is 28 and their sum is 16. What are the integers