Add or subtract matrices by combining matching positions - like adding two stock sheets of the same shop layout together to get a combined total.
They must be the same order to add or subtract.
Example: [[1,2],[3,4]] + [[5,0],[1,2]] = [[6,2],[4,6]]
Multiply every element by the same number - like doubling every quantity on a stock sheet.
2 × [[1,2],[3,4]] = [[2,4],[6,8]]
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Add [[2,3],[1,4]] and [[1,1],[2,0]].Subtract [[5,2],[3,6]] - [[1,1],[2,4]].Find 3 × [[2,-1],[0,4]].
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