## Elementary Linear Algebra 7th Edition

Using Wolfram Mathematica we obtain the following solution to this system of equations: $$x=0.8;\quad y=1.2;\quad z=-2.4$$
One of the simplest way to solve a system of linear equations by a computer is using Wolfram Mathematica and the following sequence: Solve[{120.2 x + 62.4 y - 36.5 z == 258.64, 56.8 x - 42.8 y + 27.3 z == -71.44, 88.1 x + 72.5 y - 28.5 z == 225.88 }, {x, y, z}]; which gives us for the solution: $$x=0.8;\quad y=1.2;\quad z=-2.4$$