Solve by the substitution method. If the system is inconsistent or dependent, say so.x - 2y = 4-6x - 1y = -24
A. (4, 0)
B. No solution
C. (5, 4)
D. (-4, -1)
Answer: A
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Let x represent the unknown, and write an equation for the sentence. Do not solve. Four times a number added to 7 times the number equals 33.
A. 4(x + 7) = 33x B. 4x(7 + x) = 33 C. 4x + 7x = 33 D. 4x - 7x = 33
Solve the problem.The cost for labor associated with fixing a washing machine is computed as follows: There is a fixed charge of $25 for the repairman to come to the house, to which a charge of $29 per hour is added. Find an equation that can be used to determine the labor cost, C(x), of a repair that takes x hours.
A. C(x) = 25 + 29x B. C(x) = ( 25 + 29) x C. C(x) = 29 + 25x D. C(x) = 25 - 29x
Find 
. Write the answer in polar form with the argument between 0° and 360°z1 = 1 - i, z2 = 1 - 
i
A. 
(cos 75° + i sin 75°)
B. 
(cos 15° + i sin 15°)
C. 
(cos 15° + i sin 15°)
D. 
(cos 75° + i sin 75°)
Solve the problem.Computer Incorporated sells computer systems. The company profit is given by the function 
for x ? 20, where x is the number of computer systems sold. Interpret the slope of the graph of f as a rate of change.
A. The company profit increases by $100 for each computer system that is sold. B. The company profit decreases by $138 for each computer system that is sold. C. The company profit increases by $133 for each computer system that is sold. D. The company profit increases by $138 for each computer system that is sold.