| |
| |
1. |
What is the value of the determinant? |
| |
|
 |
| |
|
A. |
12 |
B. |
-8 |
| |
|
C. |
-12 |
D. |
-3 |
| |
|
Hint |
|
| |
2. |
Use Cramer's rule to solve the system of equations. 
|
| |
|
A. |
(0.011, 0.0055) |
B. |
(0.4, 0.2) |
| |
|
C. |
(0.2, 0.4) |
D. |
(-0.4, -0.2) |
| |
|
Hint |
|
| |
3. |
Find the value of the determinant of  |
| |
|
A. |
–32 |
B. |
2 |
| |
|
C. |
64 |
D. |
6 |
| |
|
Hint |
|
| |
4. |
Solve the system –2x – 4y = 7, 3x + 5y = 9. |
| |
|
A. |
 |
B. |
(71, –39) |
| |
|
C. |
 |
D. |
 |
| |
|
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 |
|
|
|