1. 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.

2. 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?

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

4. 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

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

6. Row Matrix
--- matrix with only one row
_____ x _____ matrix
_____ x _____ matrix

7. 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 = y = 1

8. OPERATIONS ON MATRICES
add matrices
add corresponding entries
subtract matrices

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

10. Ex. 3

11. Ex. 4
If , find 3M.

12. 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