This is of the general form of equation 5.13c. The vector of unknowns B can be
solved for by premultiplying the inverse of the coefficient matrix A by the constant vec
tor C or by forming the augmented matrix as in equation 5.18. For any numerical prob
lem, the inverse of a 4 x 4 matrix can be found with many pocket calculators. The com
puter program MATRIX, supplied with this text, will also solve the augmented matrix
equation