Taking Unit 1 Test #2 Today --- AL Day 26 Agenda: Taking Unit 1 Test #2 Today --- AL Taking Unit 2 Test Today --- RB, DB, RT, KZ Taking Unit 2 Test Wed in class --- AA, NP We will go over the test Thurs.

Lesson 1: Intro to Matrices Accel Precalc Unit 3: Matrices Lesson 1: Intro to Matrices EQ: What is a matrix and how is it used to represent data?

Terms to Know: Matrix Dimensions --- a rectangular array of numbers --- measured by rows and columns

Entry --- # in a specific address in a matrix What do the numbers 2,3 correspond to in the notation a23? the entry in row 2 , column 3 6

More Terms to Know: Square Matrices --- have the same number of rows as columns; n x n 4 4

Row Matrix --- matrix with only one row   _____ x _____ matrix 1 4 _____ x _____ matrix 4 1

2x + 4 = 12 and -3y + 5 = 5y – 3 WHY? Equal Matrices --- corresponding entries are = M N _____ = ______ Ex.1 How can you use this property of equal matrices to solve for x and y? 2x + 4 = 12 and -3y + 5 = 5y – 3 WHY? x = 4 y = 1

OPERATIONS ON MATRICES add matrices add corresponding entries subtract matrices

Perform the indicated operation on each set of matrices. Ex. 2

Ex. 3

Ex. 4 If , find 3M.

Assignment: Practice Worksheet #12 – 17, 19, 25 – 29 (odd), 30, 33, 35, 36, 39, 42, 43, 45, 46, 50 – 62 DG13 Thurs --- SCIENTIFIC CALCULATOR ONLY