Matrix Addition and Subtraction

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To add or subtract two matrices, do the operation entry by entry.
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Contributed by: George Beck (OptionValue[fallbackPublishDate] {MonthName, Year, Day})
Open content licensed under CC BY-NC-SA
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"Matrix Addition and Subtraction"
http://demonstrations.wolfram.com/MatrixAdditionAndSubtraction/
Wolfram Demonstrations Project
Published: OptionValue[fallbackPublishDate] Part[DateValue[OptionValue[fallbackPublishDate], {MonthName, Year, Day}], 3] {MonthName, Year, Day}