If y = -3 [-2 -1 4 -5 0]
[-3 12 6 -8 -2]
[1 5 -4 7 -6]
which element is y(23) ?

Question

If y = -3 [-2    -1     4   -5     0] 
               [-3    12     6   -8   -2]                         
               [1        5    -4    7   -6]
which element is y(23) ? <------(23)represents a subscript

anonymous · Answer

$$y _{2,3}$$notates the 2nd row, 3rd column.  So multiplying through by the -3 on the outside, you'd have $$-3\times6=-18$$