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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. |
(52, 42) |
B. |
(4, -6) |
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C. |
(-4, -14) |
D. |
(28, 18) |
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Hint |
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2. |
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. |
-15, 4 |
B. |
-8, -3 |
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C. |
-9, -2 |
D. |
-6, -5 |
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Hint |
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3. |
Use elimination to solve the system of equations given by 6x + 15y = 15 and 4x – 5y = 25. |
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A. |
no solution |
B. |
(5, -1) |
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C. |
(10, -3) |
D. |
infinitely many solutions |
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Hint |
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4. |
Use elimination to solve the system of equations given by 6x + 2y = 0 and 3x + 7y = 24. |
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A. |
no solution |
B. |
infinitely many solutions |
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C. |
 |
D. |
(-1, 3) |
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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. |
9.75 mph |
B. |
9.23 mph |
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C. |
2.25 mph |
D. |
6.92 mph |
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Hint |
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