Week 8

Class Notes for Week 8

Day 21 - Monday, March 12, 2007
Calculator Assignment due today: Assignment 3 TI-89 Tutorial

Day 22 - Wednesday, March 14, 2007

Solving Linear Equations
(L1)3x+4y=12
(L2)-x+5y=-2

A matrix X vector = b vector
3 4 x 12
-1 5 y -2

We used these matrices to solve for x and y.

-x+2y+3z=14
x -z=5
2y+ z=-16
A matrix X vector = b vector
-1 2 3 x 14
1 0 -1 y 5
0 2 1 z -16

We made a 3x3 matrix and a vector in excel to solve for the x vector.

The solution for a linear system: X=A-1b

If the determinent = 0 then the inverse does not exist.

Day 23 - Friday, March 16, 2007
Leontif Principle is X = M-1*D

A4 - Leontif I/O is given out.
This assignment involves matrices in excel learned during this week.

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