4.1 Expand and simplify the expression (x21)2x(x32xy2). (5) 4.3 A slot machine takes only one-dollar and two-dollars coins and contains a total of thirty six coins altogether. The value of the coins in the machine is N $55. 4.3.1 Model the statement into two linear equations by letting the number of one-dollar coins to be x and the number of two-dollar coins to be y. (4) 4.3.2 Solve the two equations you formed in 4.3.1 using Cramer's rule to find the number of coins of each value. (6)