Which system of equations would represent the scenario below? Amahle is making a 22 pounds of a steel alloy that needs to be 13% magnesium. She has a steel alloy A that contains 21% magnesium and another steel alloy B that contains 9% magnesium. How many pounds of each steel alloy does she need to mix? Let x = pounds of steel alloy A Let y = pounds of steel alloy B