Solution, matrix, for simultaneous linear equations

Expressed in matrix form (see Appendix A), this becomes 

Recall that in matrix multiplication, an element in the /th row (a row is a horizontal arrangement of numbers) and yth column (a column is a vertical arrangement 

Equation 5.8 is the matrix form of all deterministic linear models. 

The matrix solution for the parameters of the simultaneous linear equations is stated here without proof  

The matrix approach to the solution of a set of simultaneous linear equations is entirely general. Requirements for a solution are that there be a number of equations exactly equal to the number of parameters to be calculated and that the determinant 

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