Solve the system of equations by substitution.
A. x = 3, y = 8; (3, 8)
B. x = 3, y = 9; (3, 9)
C. x = 2, y = 9; (2, 9)
D. x = 2, y = 8; (2, 8)
Answer: A
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Perform the indicated operation without the use of a calculator and express each answer in decimal notation.
A. 29,400,000,000,000 B. 600,000 C. 29,400,000 D. 600,000,000,000
Solve the problem.Yuri used his credit card in May to purchase the following items: tent 
sleeping bag 
camping stove ($31), and backpack ($153). On June 1, Yuri makes a payment of $337 and makes no other charges on this credit card. The bank that issues the card charges 
interest per month. What is the balance due on July 1?
A. $324.78 B. $338.31 C. $422.89 D. $681.71
Write a linear inequality in two variables to represent the situation.Mrs. White wants to crochet hats and afghans for a church fund raising bazaar. She needs 5 hours to make a hat and 4 hours to make an afghan, and she has no more than 53 hours available. Let x represent the number of hats she makes and y represent the number of afghans she makes.
A. 5x + 4y ? 53 B. 5x + 4y + 53 ? 0 C. 5x + 4y ? 53 D. 4x + 5y ? 53
Use Gaussian elimination to solve the linear system by finding an equivalent system in triangular form.
A. (0, 5, 0) B. no solution C. (0, 5, -5) D. (0, 0, 5)