Solve the system by the elimination method. 4x - 4y = 7-8x + 8y = -28
A. 
B. ?
C. {(4, 7)}
D. {(2, 4)}
Answer: B
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Verify the identity.
= 
What will be an ideal response?
Solve the system graphically. If the system has an infinite number of solutions, use set-builder notation to write the solution set. If the system has no solution, state this.x - y = 4x + y = 10
A. (6, 14) B. (7, 3) C. (3, 7) D. (14, 6)
For the restaurant bill, estimate the tip. Then find the exact amount of the tip. State your answers to the nearest hundredth.The restaurant bill is $63.41. Give the estimate of a 15% tip and the exact amount of a 15% tip.
A.
| Estimate: $12.00 | Exact: $12.68 |
B.
| Estimate: $15.00 | Exact: $15.85 |
C.
| Estimate: $6.00 | Exact: $6.34 |
D.
| Estimate: $9.00 | Exact: $9.51 |
Consider a person who invests in AAA-rated bonds, A-rated bonds, and B-rated bonds. The average yields are 6.5% on AAA bonds, 7% on A bonds, and 9% on B bonds. The person invests twice as much in B bonds as in A bonds. Let x, y and z represent the amounts invested in AAA, A, and B bonds, respectively.
Total Investment
Annual Return
$32,000
2465
Use the inverse of the coefficient matrix of this system to find the amount invested in each type of bond.
?
A. $11,000 in AAA-rated bonds$7,000 in A-rated bonds$14,000 in B-rated bonds B. $11,000 in AAA-rated bonds$14,000 in A-rated bonds$7,000 in B-rated bonds C. $14,000 in AAA-rated bonds $11,000 in A-rated bonds$7,000 in B-rated bonds D. $14,000 in AAA-rated bonds $7,000 in A-rated bonds$11,000 in B-rated bonds E. $7,000 in AAA-rated bonds$11,000 in A-rated bonds$14,000 in B-rated bonds