| |
| |
1. |
Use Cramer's rule to find the value of x in the system of equations. 
|
| |
|
A. |
 |
B. |
 |
| |
|
C. |
|
D. |
 |
| |
|
Hint |
|
| |
2. |
Solve the system –2x – 4y = 7, 3x + 5y = 9. |
| |
|
A. |
 |
B. |
 |
| |
|
C. |
 |
D. |
(71, –39) |
| |
|
Hint |
|
| |
3. |
Which of the following cannot be true concerning Cramer's Rule for two variables? |
| |
|
A. |
 |
B. |
 |
| |
|
C. |
 |
D. |
 |
| |
|
Hint |
|
| |
4. |
Vince and Brian each need two kinds of items at the store. Vince bought 10 of item A and 14 of item B, and spent $97. Brian bought 8 of item A and 25 of item B, and spent $119. How much did each item cost? |
| |
|
A. |
item A = $2.10
item B = $1.14 |
B. |
item A = $3
item B = $5.50 |
| |
|
C. |
item A = $5.50
item B = $3 |
D. |
item A = $1.14
item B = $2.10 |
| |
|
Hint |
|
| |
5. |
Which method of finding solutions would work best to find the solutions to the system 12.4x – 3.66y = 12.19, 3.9x + 6.17y = 19.28, and why? |
| |
|
A. |
elimination, because 6.17 is a factor of 3.66 |
| |
|
B. |
elimination, because Cramer's Rule doesn't apply to this problem |
| |
|
C. |
Cramer's Rule, because none of the other methods will correctly solve the problem |
| |
|
D. |
Cramer's Rule, because there are fewer calculations. |
| |
|
Hint |
|
|
|