Chapter 10 - 10.1 - Matrices and Systems of Equations - 10.1 Exercises - Page 710: 58

The matrix is represented by: x + 2y - 2z = -1 y + z = 9 z = -3 The variables are: x = -31 y = 12 z = -3

The matrix is represented by the following system of equations: x + 2y - 2z = -1 y + z = 9 z = -3 Using back substitution to solve the system: y - 3 = 9 y = 12 x + 2(12) - 2(-3) = -1 x + 24 + 6 = -1 x + 30 = -1 x = -31 The variables are: x = -31 y = 12 z = -3