5- (a) IfA = ['1' g] and B = [g if], can AB = BA? (6 marks) (b) Consider the following system of equations where the variables P1 , P2 and P3 represent the price of three interdependent commodities: 6P1 + 4P2 + 3P3 = 20 4P1 + P2 = 10 7P2 + 8P3 = 15 i. Write the system of equations in matrix form. (2 marks) ii. Use Cramer's rule to find the equilibrium prices, 1-} , P2 and}