Can you find me the correct solution for this problem please?

6. (a) Solve for x and y using matrices: x + 2y = 13 2x - 5y = 8 (4 marks) (b) Bob goes to a supermarket each week and always buys 5 chocolate bars, 6 packets of crisps and 2 litres of strawberry milkshake. The respective prices are $2.50 per chocolate bar, E3 per packet of crisps and $3.50 per litre of strawberry milkshake. (1) Define two vectors, one for quantities of the items purchased, and the other for the prices of the items, such that the product of the two vectors will give the total cost of the basket of goods purchased by Bob. (2 marks) (ii) Calculate the total cost of the goods purchased by Bob using matrix multiplication. (2 marks) (iii) If the price of chocolate bars rises by 0.2 pounds per chocolate bar, the price of crisps rises by 0.4 pounds per packet, and the price of strawberry milkshake falls by 2 pound per litre, calculate by matrix multiplication the change in the cost of the basket of goods purchased by Bob. (2 marks)