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Opener 1.What is the reciprocal of 1/9? 2.What is |-8+-2|? 3.In January, the wind chill was -8 degrees. In August, the heat index was 108. Find the difference between these temperatures.
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Page 1: The matrix

Opener1. What is the reciprocal of 1/9?

2. What is |-8+-2|?

3. In January, the wind chill was -8 degrees. In August, the heat index was 108. Find the difference between these temperatures.

Page 2: The matrix

What is the matrix?

Page 3: The matrix

The Matrix is a movie…..

The Matrix is a 1999 American science-fiction-action film starring Keanu Reeves.

The plot according to the Internet Movie Database: A computer hacker learns from mysterious rebels

about the true nature of his reality and his role in the war against the controllers of it.

Page 4: The matrix

The Math Matrix• a rectangular array of quantities or

expressions set out by rows and columns;• treated as a single element and manipulated

according to rules•

1436

8846

7351

Page 5: The matrix

The Math Matrix

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Adding and Subtracting

• Add or subtract each element in the first matrix by its corresponding element in the other matrix.

• Matrices MUST be the same size to add or subtract. – They MUST have the same number of rows and

columns• The answer matrix will be the same size as the

matrices in the original problem.

Page 7: The matrix

Adding

Page 8: The matrix

Subtracting

Page 9: The matrix

Practice

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Multiplication by scalar

• To multiply a matrix by a scalar, simply multiply each element by the scalar.

• The answer matrix will be the same size as the matrix in the problem.

Page 11: The matrix

Multiplication by scalar

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Multiplication by scalar

• This matrix represents the sales total, in dollars, of two pet store owners. If there is a 5% tax, how much tax will be charged in each store for each pet?

Page 13: The matrix

Practice

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