The augmented matrix of a system of equations has been transformed to an equivalent matrix in row-echelon form. If the system is consistent, then give the solution. If it is not, then state that it is inconsistent.
A. (7 - 6z, -2 + 2z, z)
B. (7 + 6z, -2 - 2z, z)
C. (7 - z, -2 + z, z)
D. (7, -2, z)
Answer: A
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Perform the indicated operation.
A. 
B. 
C. - 
D. - 
Solve the problem.Suppose that a sales person observes that if an item is priced at $7 per item then 5 items are sold. If 3 items are sold for $9 per item then find an equation to model the number y of items sold for x dollars per item.
A. y = x - 2 B. y = -x + 12 C. y = x + 12 D. y = -x - 2
Solve the equation algebraically.1.4x + 1.7 = -10.1 + 7.3x
A. -18 B. 2 C. 1.8 D. 1.6
Solve the system by the elimination method or a combination of the elimination and substitution methods.x2 + 4xy + 2y2 = 1 x2 - 4xy - 2y2 = 1
A. {(1, 0), (-1, 0), (1, -2), (-1, 2)} B. {(1, 1), (-1, -1), (1, -2), (-1, 2)} C. {(1, 0), (1, 1)} D. {(1, -2), (-1, 2)}