the following two food mixes contain the percentage of protein and fat given in the table: food mix protein (%) fat (%) a 20 4 b 14 3 if xa represents the number of oz. of food a consumed and xg represents the number of oz. of food b consumed: a) write a system of equations for a diet that requires 80 oz. of protein and 17 oz. of fat. in the system of equations, the first equation should represent protein requirement, the second equation should represent the fat requirement, and the first element in each equation should correspond to food a. b) write the augmented matrix corresponding to the system of equations in part a. c) find the values of x and x using gauss-jordan elimination. support your answer with calculations and state all the row operations you performed.