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1. |
Solve the system of equations by elimination.
2x + y - z = 3
x + y + z = 5
x - 2y + z = 2
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A. |
(2, 1, 2) |
B. |
(1, 1, 2) |
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C. |
(1, 2, 1) |
D. |
(2, 2, 1) |
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Hint |
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2. |
The equation 2x - y + 3z = 5 represents _____________ |
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A. |
a circle. |
B. |
none of these. |
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C. |
a plane. |
D. |
a line. |
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Hint |
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3. |
Three planes can |
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A. |
All of the choices are true. |
B. |
intersect at one point. |
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C. |
have no points in common. |
D. |
intersect in a line. |
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Hint |
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4. |
Solve the system of 3 equations by substitution. x = 3y + 2z
2x + 3y + 2z = 3
-x + y - z = 6 |
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A. |
(8, 4, -2) |
B. |
infinite solutions |
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C. |
(1, 3, -4) |
D. |
no solution |
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Hint |
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5. |
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. |
(3, 4, 2) |
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C. |
infinite solutions |
D. |
(2, -5, 3) |
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Hint |
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