#### Answer

The system of equations is:
x - y + 2z = 4
y - z = 2
z = -2
The variables are:
x = 8
y = 0
z = -2

#### Work Step by Step

The matrix is represented by the following system of equations:
x - y + 2z = 4
y - z = 2
z = -2
Using back substitution to solve the system:
y - (-2) = 2
y + 2 = 2
y = 0
x - (0) + 2(-2) = 4
x = 8
The variables are:
x = 8
y = 0
z = -2