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March 5, 2015

March 5, 2015

Posted by **Matt** on Tuesday, October 25, 2011 at 11:46pm.

(a)

3x1 − 2x2 = −1

4x1 + 5x2 = 3

7x1 + 3x2 = 2

(b)

2x1 + 2x3 =1

3x1 − x2 + 4 x3 = 7

6x1 + x2 − x3 = 0

(c)

x1 + 2x2 − x4 + x5 =1

3x2 + x3 − x5 = 2

x3 + 7x4 =1

(d)

x1 =1

x2 = 2

x3 = 3

- Math -
**Steve**, Wednesday, October 26, 2011 at 1:51pmWhat's the problem? You have all the coefficients and constants. Just write them down as an array. Just copy what you have, throwing all the variable names away, aligning the numbers in columns.

For example, #c is

1 2 0 -1 1 | 1

0 3 1 0 -1 | 2

0 0 1 7 0 | 1

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