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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
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A. |
Add the first and second equations to eliminate the z variable. |
B. |
Subtract the second and third equation to eliminate the z variable. |
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C. |
Neither method will work. |
D. |
Both methods will work. |
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Hint |
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2. |
The equation 2x - y + 3z = 5 represents _____________ |
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A. |
none of these. |
B. |
a circle. |
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C. |
a line. |
D. |
a plane. |
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Hint |
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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? |
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A. |
(40, 212, 120) |
B. |
(212, 40, 120) |
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C. |
(40, 120, 212) |
D. |
(120, 40, 212) |
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Hint |
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4. |
Solve the system of three equations by elimination: 5x + 2y - 3z = 10
2x - 2y + 4z = 6
x - y + 2z = 3
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A. |
no solution |
B. |
(2, -5, 3) |
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C. |
infinite solutions |
D. |
(3, 4, 2) |
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Hint |
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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 |
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A. |
Method I |
B. |
Method II |
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C. |
neither method is correct. |
D. |
both methods are correct |
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Hint |
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