On the Beach Cafe sells 140 cream sodas and earns $175.00. What is the unit price of the sodas? How much will On the Beach Cafe
2 answers:
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Express the matrix like
, where
if
and
if
. (
is known as kronecker's delta)
In the same form we express the matrix .
The firs index indicate the row and the second the column.
By the multiplication of matrices we have , where
because only is non-zero in the last sum.
therfore we have .
In the same manner we have
, where
And so,