Multiplication of two matrices possible if the number of columns in the

first matrix equals the number of rows in the second matrix.

The dimensions of the matrix J are  and the number of columns in

the matrix J is 1.

The dimensions of the matrix K are and the number of the rows in the matrix K is 2.

The number of columns in the matrix J is not equals the number

of rows in the matrix K.

So, matrix product JK is impossible.

The matrix product JK is impossible.