Carry out the math element by element. For example, ...
c11 = -7a11 +3b11
c11 = -7(8) +3(5) = -41
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<em>Additional comment</em>
Matrix operations like this one are easily handled by all spreadsheets and most graphing calculators. Some scientific calculators support matrix operations as well.
Step-by-step Explanation: It does not tell you how much you had before they added 2 1/4 cups of water. all you need is a variable to represent the unknow number. A variable is a letter that represents something, A-Z.