1. Assignment:
1­­>L6,6, pg. 372 ­ 373, #2­22 (evens) ­ Due Monday (1/30)
2­­>Checkpoint 6.4 ­ 6.5 ­ Due Monday (1/30)
3­­>Chapter 6 Test ­ Thursday (2/2)
1

2. Lesson 6.6 WarmUp:
Determine the best way to solve each system ­ then solve it!
1) ­3x + y = ­3
4x + 2y = 14
2) y + 4x = 3
y = ­4x ­ 1
3) 4x + 2y = 10
5x ­ 3y = 7
4) At a SJ basketball game, the team scored a total of 45 points. Some of the shots were
3 pts and some of the shots were 2 pts. Find out how many of each were made, if they
made a total of 18 baskets.
5) Adult tickets are $15 and student tickets are $12. If a total of 11 tickets were bought
and the cost was $156, how many of each type was bought?
2

3. Lesson 6.6:
*matrix ­ a rectangular arrangement of numbers in rows and columns
enclosed in brackets.
*element ­ each number in a matrix
*dimensions ­ the number of rows and columns in a matrix
[ 7
­1
0
­9
3
­4
5
­3
8
3
6
2
[ } rows
}
this is a 3 x 4 matrix
columns ­3 is row 2, column 3
3

4. *If 2 matrices have the same dimensions, they can be added or
subtracted....if not, they are impossible!
**Also, you can multiply a matrix by a constant called a scalar.....and is
known as scalar multiplication.
4

5. Lesson 6.6 examples:
Perform the indicated matrix operations.
A)
[ 8
­3
­1
11
7
­2
5
8
0
[ + [ ­4
6
7
10 ­9
­12 ­1
5 3
[
B)
[ 8
­3
­1
11
7
­2
5
8
0
[ ­ [ ­4
6
7
10 ­9[
­12 ­1
5 3
5

6. [
C) 2 ­1 0 [
1 ­3 5
5 7 10 ­11
8 ­9 ­4
[
D) 2 ­1 0 [
1 ­3 5
­5 7 10 ­11
8 ­9 ­4
6