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1. |
Select the system of equations in which you should use subtraction to eliminate one of the variables. |
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A. |
x + y = 1 and
4x – y = 9 |
B. |
4y – 3x = 10 and
y + 3x = 15 |
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C. |
–5y + x = 12 and
5y + 2x = 16 |
D. |
2x + y = 10 and
2x – 3y = 7 |
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Hint |
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2. |
The sum of the digits of a two–digit number is 7. If the tens digit is 1 more than the units digit, what is the number? |
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A. |
43 |
B. |
25 |
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C. |
52 |
D. |
34 |
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Hint |
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3. |
Use elimination to solve the system 4y + 2x = 10 and y + 2x = 1. |
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A. |
(1, -3) |
B. |
(-1, 3) |
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C. |
(3, -1) |
D. |
(-3, 1) |
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Hint |
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4. |
Use elimination to solve the system
3x + 7y = 10 and
4x – 7y = -3. |
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A. |
(1, 1) |
B. |
(-1, -1) |
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C. |
(-1, 1) |
D. |
(1, -1) |
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Hint |
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5. |
The sum of the digits of a two-digit number is 13. If the tens digit is 3 more than the units digit, what is the number? |
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A. |
58 |
B. |
24 |
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C. |
85 |
D. |
42 |
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Hint |
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