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1. |
Use Cramer's rule to find the value of x in the system of equations. 
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A. |
 |
B. |
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C. |
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D. |
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Hint |
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2. |
Use Cramer's rule to solve the system of equations. 
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A. |
(0.2, 0.4) |
B. |
(0.4, 0.2) |
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C. |
(0.011, 0.0055) |
D. |
(-0.4, -0.2) |
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Hint |
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3. |
Find the determinant of  |
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A. |
-16 |
B. |
-11 |
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C. |
0 |
D. |
-21 |
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Hint |
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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? |
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A. |
item A = $2.10
item B = $1.14 |
B. |
item A = $5.50
item B = $3 |
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C. |
item A = $3
item B = $5.50 |
D. |
item A = $1.14
item B = $2.10 |
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Hint |
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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. |
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A. |
(–147, –87) |
B. |
(–1.79, 1.06) |
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C. |
(1.79, 1.06) |
D. |
(147, 87) |
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Hint |
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