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  • 1 Post By studiot
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July 29th, 2015, 11:12 AM   #1
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Linear Equations 4 Variables

I usually don't have problems solving these, but this one is really quite annoying for some reason.


From there, I got here


And then was stuck. Help?
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July 29th, 2015, 11:19 AM   #2
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number the equations 1, 2, 3 and 4

From equation 1) y+z = 6-w equation 5

add equations 2 and 3 to form equation 6

Substitute for y+z in equation 6 and in equation 4

You now have two equations in two unknowns x and w you should be able to solve it all from there.
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July 29th, 2015, 11:38 AM   #3
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x - w = 3
3w + z = 5
x + y - z = 5 $\displaystyle \implies$ z = 2. It's easy to finish from there.
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