| |
| |
1. |
Use Cramer's rule to find the value of x in the system of equations. 
|
| |
|
A. |
 |
B. |
 |
| |
|
C. |
 |
D. |
|
| |
|
Hint |
|
| |
2. |
Which of the following cannot be true concerning Cramer's Rule for two variables? |
| |
|
A. |
 |
B. |
 |
| |
|
C. |
 |
D. |
 |
| |
|
Hint |
|
| |
3. |
Solve the system 3x + 2y – z = –1, –2x + –3y + 2z = 5, 4x – y + 3z = 11. |
| |
|
A. |
(1, –1, 2) |
B. |
(2, 4, –2) |
| |
|
C. |
(2, –1, 2) |
D. |
(1, 4, –3) |
| |
|
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 = $1.14
item B = $2.10 |
B. |
item A = $2.10
item B = $1.14 |
| |
|
C. |
item A = $5.50
item B = $3 |
D. |
item A = $3
item B = $5.50 |
| |
|
Hint |
|
| |
5. |
Two sides of an angle are contained in lines whose equations are 6x + 4y = 15 and 7x – 9y = 3. Find the coordinates of the vertex of the angle. Round to the nearest hundredth. |
| |
|
A. |
(1.79, 1.06) |
B. |
(–147, –87) |
| |
|
C. |
(–1.79, 1.06) |
D. |
(147, 87) |
| |
|
Hint |
|
|
|