Liam wants to buy a car and pay for it in three installments. the total cost of the car is $29,000. two times the first installment is $1,000 more than the sum of the third installment and three times the second installment. liam must pay 15% interest on the second and the third installments: the interest will amount to $2,100. if x, y, and z represent the first, second, and third installments, respectively, identify the augmented matrices that model liam's situation.