ERG 2018 Tutorial 2
September 16, 2008
EX 1
Solve the system of linear equations
x
1
+ 2
x
2
+ 4
x
3
= 5
x
2
+ 2
x
3
= 2
3
x
1
+
x
2
+
x
3
= 4
Analysis
: Using matrix notation. Let
A
=
1 2 4
0 1 2
3 1 1
x
=
x
1
x
2
x
3
b
=
5
2
4
1. Inverse Matrix
x
=
A

1
*
b
2. Cramer’s rule
x
i
=
det
(
A
i
)
det
(
A
)
i
= 1
,
2
,
3
3. Gauss elimination (using lower triangular matrix form)
EX 2
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This note was uploaded on 11/13/2010 for the course SEEM SEEM2018 taught by Professor Chan during the Spring '10 term at CUHK.
 Spring '10
 Chan

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