$\"\"$

For adding matrices, their dimension should be equal.

First write the dimension of the matrix.

The first matrix is $\"\"$

The matrix has 2 rows and 1 column, so dimensions of matrix are $\"\"$ ..

The second matrix is $\"\"$

The matrix has 2 rows and 1 column, so dimensions of matrix are $\"\"$ .

The third matrix is $\"\"$

The matrix has 2 rows and 2 column, so dimensions of matrix are $\"\"$ . $\"\"$

The dimensions of matrix are not equal.

The operation of subtraction and addition is impossible. $\"\"$

The operation of subtraction and addition is impossible. \ \