For homework tonight, all you need to do is write the 3x3 systems as matrices. Don't worry about the word problems yet or solving if you don't have a graphing calculator.
Ex:
3x + 2y -1z = 10
-4x + 1y = 0
x + y + z = 23
becomes:
[ 3 2 -1 10]
[ -4 1 0 0]
[1 1 1 23] --> except the brackets are all one line like the examples from class
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