Mike + Fred = 5800 (1) (Fred + 2000) + Fred = 5800 2*Fred = 5800 - 2000 2*Fred = 3800 Fred = 3900/2 = 1900 dollars (Fred's salary) From equation (1), Mike = 5800 - Fred = 5800 - 1900 = 3900 dollars (Mike's salary).