How to use determinant method to find four unknown equations?
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A matrix is a rectangular array of numbers. Each
number in a matrix is called an element of the matrix.
The matrix at the right, with three rows and four
columns, is called a (read “3 by 4”) matrix.
A matrix of m rows and n columns is said to be of order . The matrix above has
order . The notation refers to the element of a matrix in the ith row and the jth
column. For matrix A, , , and .
A square matrix is one that has the same number of
rows as columns. A matrix and a matrix
are shown at the right. Associated with every square
matrix is a number called its determinant.
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