1.   If you solve the following system of equations by elimination, which of the following is the best choice for the first step?

2x + y - z = 3
x + y + z = 5
x - 2y + z = 2

    A. Subtract the second and third equation to eliminate the z variable. B. Neither method will work.
    C. Both methods will work. D. Add the first and second equations to eliminate the z variable.
    Hint

  2.   Three planes can
    A. All of the choices are true. B. have no points in common.
    C. intersect at one point. D. intersect in a line.
    Hint

  3.   In 1999 Bob scored 824 points as a college basketball player by hitting 372 of his attempts. If he made 60% of his 200 3-point field goal attempts, how many 1-, 2-, and 3-point field goal baskets did he make?
    A. (40, 212, 120) B. (120, 40, 212)
    C. (40, 120, 212) D. (212, 40, 120)
    Hint

  4.   Solve the system of three equations by elimination:

5x + 2y - 3z = 10
2x - 2y + 4z = 6
x - y + 2z = 3

    A. (3, 4, 2) B. (2, -5, 3)
    C. infinite solutions D. no solution
    Hint

  5.   If you are solving this system of equations by elimination, which of the following is the best choice for the first step?

2x + 3y - z = 4
-x + y + 2z = 3
3x + y + z = 1

    A. neither method is correct. B. Method I
    C. both methods are correct D. Method II
    Hint