Solve the system of linear equations below by inverting the coeficient matrix.

(worth 20 points) Solve the system of linear equations below by inverting the coeficient matrix and using Theorem that states: If A is an invertible n x n matrix, then for each nx 1 matrix b, the system of equations Ax-b has exactly one solution, namely, x = A-1b. Once you find the solution x, check that the solution x solves the system. x1 + 3x2 + x3 = 4 2x1 +2x2 +X31 2x, +3x2 +x3 3