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1. |
Use elimination to solve the system of equations given below.
3x + 4y = -12
x - y = 10 |
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A. |
(4, -6) |
B. |
(52, 42) |
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C. |
(28, 18) |
D. |
(-4, -14) |
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Hint |
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2. |
Use elimination to solve the system of equations given below.
5x + 3y = 3
3x + 4y = 15 |
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A. |
(3, -4) |
B. |
(-3, 6) |
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C. |
(5, 0) |
D. |
 |
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Hint |
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3. |
The sum of two numbers is –11. Twice the first number minus four times the second number is –10. What are the two numbers? |
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A. |
-8, -3 |
B. |
-9, -2 |
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C. |
-15, 4 |
D. |
-6, -5 |
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Hint |
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4. |
Use elimination to solve the system of equations given by 3x + 4y = 5 and 21x + 28y = 35. |
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A. |
 |
B. |
 |
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C. |
no solution |
D. |
infinitely many solutions |
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Hint |
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5. |
A boat travels 30 miles upstream in 4 hours. The trip downstream takes 2.5 hours. Find the rate of the boat in still water. |
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A. |
6.92 mph |
B. |
2.25 mph |
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C. |
9.23 mph |
D. |
9.75 mph |
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Hint |
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