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Unformatted text preview: s to solve systems? Let’s start
with a system of two equations and two unknowns. ax + by = p
cx + dy = q We first write down the augmented matrix for this system, éa b
êc d
ë pù
qú
û and use elementary row operations to convert it into the following augmented matrix. é 1 0 hù
ê0 1 k ú
ë
û
© 2007 Paul Dawkins 327 http://tutorial.math.lamar.edu/terms.aspx College Algebra Once we have the augmented matrix in this form we are done. The solution to the system will be
x = h and y = k .
This method is called GaussJordan Elimination. Example 1 Solve each of the following systems of equations.
3x  2 y = 14
(a)
[Solution]
x + 3y = 1
(b) 2 x + y = 3
[Solution]
x  4 y = 2 (c) 3 x  6 y = 9
[Solution]
2 x  2 y = 12 Solution
(a) 3x  2 y = 14
x + 3y = 1 The first step here is to write down the augmented matrix for this system. é3 2 14 ù
ê 1 3 1ú
ë
û
To convert it into the final form we will start in the upper left corner and the work in a counterclockwise direction until the first two columns appear as they should be.
So, the first step is to make the red three in the augmented matrix above into a 1. We can use any
of the row operations that we’d like to. We should always try...
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 Spring '12
 MrVinh

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