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March 5, 2015

March 5, 2015

Posted by **JaneLee** on Friday, October 26, 2007 at 11:17am.

3.7x - 2.3y + 4.2z = 8

2.6x + 4.6y - 3.9z = 10

8x + 2z = 20

- Algebra II -
**Reiny**, Friday, October 26, 2007 at 12:06pmDoing this question by matrices seems inefficient and leads to some "nasty" arithmetic if done by hand

Why don't you take the last equation, which reduces to

z = 10 - 4x

and substitute that into the first two equations.

The resulting 2 equations in 2 unknowns does not appear too bad.

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