Respuesta :

highwireact

The element [tex] a_{13} [/tex] is the entry in the 1st row and 3rd column of the matrix, which, in this case, is 7.


Edit: Got my rows/columns mixed up! Row 1, Column 3 is actually -1, as the original poster pointed out.

jcherry99

The row is the first number in a13. Rows go across. So you are in the top row.

The 3 or second number is the column. Columns go up and down.


Row 1 column 3 is the - 1.


The answer is C.