# Unit 2: What is a matrix - really?

Learning Target: I will organize information using matrices, give dimensions of a matrix and identify elements of a matrix. Homework: Organizing Data into Matrices Worksheet U N I T 2 : W H AT I S A M AT R I X R E A L LY ? Sec 1: Organizing Data into Matrices What do you think a matrix is? DEFINITION Matrix (plural: matrices) a rectangular array of numbers written within brackets. T H I N G S Y O U C A N D O W I T H A M AT R I X

Organize Information Add, Subtract and Multiply to find quantities quickly with large groups of information. Find missing quantities Solve systems of equations Transform geometric figures: rotate, reflect, translate EX 1: DIMENSIONS The number of horizontal rows and vertical columns determine the dimensions of a matrix State the dimensions of each matrix. A. 4 [ 2

1 6 3 0 5 7 9 ] [ 1 B. 4 3

3 ] 1 2 0 0.5 [] C. EX 2: I D E N T I F Y I N G A M AT R I X ELEMENT

A= Find each of the following elements: EX 3: ORGANIZING DATA U.S. Russia Production Column1 China Energy is often measured in British Thermal Units (Btu).

1. Write a 3 x 2 matrix to represent the data above. 2. Rewrite the information as a 2 x 3 matrix. EX 4: GYMNASTICS Gymnast Floor Exercise Vault Balance Beam Uneven Bars Amy Chow

9.525 9.468 9.625 9.400 Dominique Dawes 9.087 9.393 8.600

9.675 Kristin Maloney 9.525 9.225 9.312 9.575 Elise Ray 9.225 9.468

9.687 9.687 a. Write a matrix W to represent the information. b. What are the dimensions of the matrix? c. Which element represents Kristin Maloneys score on the vault? HOMEWORK Organizing Data into Matrices Worksheet

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