Answer
please see work step-by-step
Work Step by Step
A matrix is an array of $m\times n$ numbers
organized in m rows and n columns
$A=\left[\begin{array}{llll}
a_{11} & a_{12} & ... & a_{1n}\\
a_{21} & a_{22} & .... & a_{2n}\\
... & ... & ... & ...\\
a_{m1} & a_{m2} & ... & a_{mn}
\end{array}\right]$,
The numbers $a_{ij}$ in the matrix are called elements of the matrix.
$a_{ij}$ = element in row i, column j.
