Use the Gauss-Jordan method to solve the system of equations. 4x - y + 3z = 12 x + 4y + 6z = -32-3x + 3y + 9z = 20
A. (2, -7, -1)
B. (-8, -7, 9)
C. (8, -7, -2)
D. No solution
Answer: D
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 3x2 - 3y2
A. Domain: all points in the xy-plane; range: all real numbers; level curves: ellipses 
B. Domain: all points in the xy-plane; range: real numbers z ? 0; level curves: ellipses 
C. Domain: all points in the xy-plane; range: all real numbers; level curves: hyperbolas 
D. Domain: all points in the first quadrant of the xy-plane; range: all real numbers; level curves: hyperbolas 
Solve the problem.If m?x = 38° in the following figure, find the measures of ?w, ?y, and ?z. 
A. m?z = 38°, m?w = m?y = 52° B. m?z = 52°, m?w = m?y = 142° C. m?z = 142°, m?w = m?y = 38° D. m?z = 38°, m?w = m?y = 142°
Solve and check.x(x - 6) = 16
A. 2, -8 B. -2, -8 C. -2, 8 D. 2, 8
Find the value of the expression.|-7| - |-25|
A. 18 B. 32 C. -18 D. -32