Write the system of linear equations represented by the augmented matrix. Use x, y, z, and, if necessary, w for the variables. Then use back-substitution to find the solution.
A. {(-7, 80, 602, -517)}
B. {(-517, 602, 80, -7)}
C. {(-4, 0, 7, -8)}
D. {(-2, 0, 17, -7)}
Answer: B
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A. 18xy + 23 B. 13x + 13y + 23 C. 13x + 5y + 23 D. -3x + 13y + 23
Plot the given polar coordinate point in the polar coordinate system.
A. 
B. 
C. 
D. 
Solve the equation.-3a + 3 + 4a = 7 - 23
A. -19 B. -33 C. 33 D. 19
Solve the problem.A bookcase is to be constructed as shown in the figure below. The height of the bookcase is 3 feet longer than the length of a shelf. If 18 feet of lumber is available for the entire unit (including the shelves, but NOT the back of the bookcase), find the length and height of the unit.
A. length = 7.5 ft; height = 9 ft B. length = 2 ft; height = 5 ft C. length = 3 ft; height = 6 ft D. length = 2 ft; height = 6 ft