A matrix A has 3 rows and 4 columns, and its entry in row i and column j is aij = 2i - j…

A matrix of order $m \times n$ has $m$ rows and $n$ columns, and $a_{ij}$ is in row $i$, column $j$. Equal matrices have equal entries in the same places. Add matrices of the same order entry by entry. A scalar multiple multiplies every entry.