Algebra Class 1
1) Solving Linear System Using Gaussian &
Gauss-Jordan Elimination
.
· Linear system is made up of linear
equation .
E
3x +
2y = 7
X
4y = 3
-
·
Find variables X BY that satisfy both
equation .
ASIDE : Linear equation is an
equation
of the form :
92Xz + &gXz +
9 , X, + ...
L
Coefficient ↳ variable
·
common example in R
- I dimension
·
Equation of a line >
- ax +
by =
C
·
In R3
↳ 3 dimension
-a constant
ax +
by + c =
, ·
The
following not linear
X+ have power
y3 3
any
&
=
# ,
+ X +
X - 7 =
0 other than 1
linear
not
equation
A Linear system can
only have 3 possible
·
outcome.
1
Unique Solution
3
.
Consistent
.
2 Infinite # of solution
. No
3 solution inconsistent
>
-
system
·
Example in R2 :
①2x
②[
1 5
E
+ =
3X 0
y
-
=
③
, D
- * (1 3)
,
5x =
5
X = 1
3
y
=
②
2(zX + y 5) =
-
4x +
2y = 5
Yfinite
4x
2y 18
-
+ =
e, Be
are the same
* Infinite solutions we use , parameters
with
parametic solutions we usually
isolate the .
first variable
5 line
Grepresent
2X + same
y
=
4x + 10
2y
=