What are the values of m and n in the matrix addition? the 2 by 2 matrix, row 1, column 1, n minus 1 column 2, 6 row 2, column 1, negative 19 column 2, m plus 3 plus the 2 by 2 matrix, row 1, column 1, negative 1 column 2, 0 row 2, column 1, 16 column 2, negative 8 is equal to the 2 by 2 matrix, row 1, column 1, 10 column 2, 6 row 2, column 1, negative 3 column 2, 40