Opening Assignment

Find the inverse of the following:

4 -5-3 4[ ]

Parent Teacher Conference

You will sit in front of a computer and show your parents the following: Norfarlogic.pbworks.com site Google Documents from Smith Project Smartweb to show your grade

Video Tutorial Project

Storyboard given back to teams Final storyboard is due Monday Video tutorial due date is moved to

October 12 Video tape before school, after school or

during lunch

Old Project & Test-1st Hour

You have to make up or retake any past tests or projects if you fail. Below are people who were absent.

Quiz from September 18: 469456, 704261, 147741, 704168, 469302

Test from September 23: 908373, 147741, 704168, 469302

Old Project & Test-3rd Hour

You have to make up or retake any past tests or projects if you fail. Below are people who were absent.

Quiz from September 18: 809971, 712697

Test from September 23: 712697, 466307, 808090

Old Project & Test-6th Hour

You have to make up or retake any past tests or projects if you fail. Below are people who were absent.

Quiz from September 18: 710257, 467418, 455005

Test from September 23: 805661, 703391, 806932

Old Project & Test-7th Hour You have to make up or retake any past tests

or projects if you fail. Below are people who were absent.

Quiz from September 18: 148799, 714241, 186417, 118156

Test from September 23: 801369

Smith Project: 714241, 914097, 192904 (Spreadsheet & Presentation) 056872, 196121, 088093, 014280 (Presentation)

Solving Systems Using Inverse Matrices

Use inverse matrix to solve the linear system: x + y = 2

7x + 8y = 21

[ ]

1. Write the equation in matrix form.

1 17 8

xy

221[] ] ][=

2. Find the inverse of the first matrix.

11

8 -1-7 1[ =

8 -1-7 1[ ]

Solving Systems Using Inverse Matrices

Use inverse matrix to solve the linear system: x + y = 2

7x + 8y = 21

]

3. Multiply the inverse matrix by the constants.

221][ =

(8)(2) + (-1)(21)(-7)(2) + (1)(21)

-5 7[=

8 -1-7 1[ ] 16 + -21

-14 + 21 = = ] x y[

Practice

1. x + y = 5 3x – 4y = 82. x + 2y = 6 4x – y = 5

Which of the following is not a method for solving a system of equations?

A. Cramer’s Rule

B. Elimination

C. Pythagorean Theorem

D. Inverse Matrix