Solve the system of equations by Gaussian elimination. If there is an unlimited number of solutions, find two of them. 6x - 3y + 4z = 9 4x + 8y + 6z = 9 18x - 9y + 12z = 2
A. x = 0, y = 0, z = 0
B. x = 9, y = 9, z = 2
C. x = 3, y = 3, z = -1
D. Inconsistent
Answer: D
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Solve the problem.A heat duct in the college library has a circular cross section with a radius of 4 inches and a length of 25 feet. How much paint (in square feet) is needed to paint the duct?
A. 314 ft2 B. 628 ft2 C. 26.2 ft2 D. 52.3 ft2
Determine whether the variation between the indicated quantities is direct or inverse.The time to paint a house and the number of people painting.
A. Inverse B. Direct
Simplify the expression. Assume all variables represent positive real numbers.4
- 3x
A. (4 - 3x)
B. cannot be simplified
C. x
D. 2x
Fill in the blank with one of the words or phrases listed below.
In a system of linear equations in two variables, if the graphs of the equations are different, the equations are 
equations.
A. substitution B. addition C. independent D. dependent