1. | If you solve the following system of equations by elimination, which of the following is the best choice for the first step? 2 x + y - z = 3x + y + z = 5x - 2y + z = 2 |
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Subtract the second and third equation to eliminate the z variable. |
Neither method will work. | |||||

Both methods will work. | Add the first and second equations to eliminate the z variable. |
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Hint | ||||||

2. | Three planes can | |||||

All of the choices are true. | have no points in common. | |||||

intersect at one point. | 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? | |||||

(40, 212, 120) | (120, 40, 212) | |||||

(40, 120, 212) | (212, 40, 120) | |||||

Hint | ||||||

4. | Solve the system of three equations by elimination: 5 |
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(3, 4, 2) | (2, -5, 3) | |||||

infinite solutions | 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? 2 |
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neither method is correct. | Method I | |||||

both methods are correct | Method II | |||||

Hint | ||||||