Solve the system of equations using matrices. Use Gaussian elimination with back-substitution.x - y + 4z=205x + z= 4x + 3y + z=-8
A. {(0, 4, -4)}
B. {(4, -4, 0)}
C. {(0, -4, 4)}
D. {(4, 0, -4)}
Answer: C
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Give a geometric description of the set of points whose coordinates satisfy the given conditions.x2 + y2 ? 1, z = -2
A. All points within the parabola x2 + y2 = 1 in the plane z = -2 B. All points on the cylinder with radius 1 along the z-axis C. All points on or outside of the circle x2 + y2 = 1 and in the plane z = -2 D. All points on or within the circle x2 + y2 = 1 and in the plane z = -2
Determine whether or not the points are vertices of the given geometric figure.(7, -1), (9, 3), and (11, 2); right triangle
A. Yes B. No
Answer the question.Which one of the following methods cannot be used to solve the equation 
A. Quadratic formula B. Factoring C. All of the methods can be used. D. Completing the square
Solve the linear equation with the intersection-of-graphs method. Approximate the solution to the nearest hundredth if necessary.-6.2(x + 7.1) = -9.8(7.4 - 7x) + 20.9
A. -0.12 B. 0.1 C. 0.66 D. 1.28