Transcript
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.
What is 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.
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•
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The Math Matrix
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.
Adding
Subtracting
Practice
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.
Multiplication by scalar
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?
Practice
ComingTomorrow
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