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April 23, 2014

April 23, 2014

Posted by **Anonymous** on Friday, January 28, 2011 at 7:51pm.

2w-x-y+2z=7

2w+3x+2y-z=-2

3w-2x-y-3z=-2

solve for w, x, y, z

- math -
**drwls**, Friday, January 28, 2011 at 8:14pmNo.

Eliminate variables one at a time, or use Kramer's method of determinants.

Here is how to get rid of x. Add the first two equations.

3w + 3z = 9 or

w + z = 3

Multiply the third equation by 2 and the fourth equation by 3, and add.

4w + 6x + 4y - 2z = -4

9w - 6x - 3y - 9z = -6

13w -y - 11z = -10

Continue in that manner until you are left with the value of one of the variables.

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