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June 30th, 2012, 05:04 AM   #1
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Simultaneous Equations

Having a bit of trouble with this one. Can anyone help?

Many thanks.

Q. Solve the 3 unknowns:
...1
...2
...3

Attempt:
...1
(mult. by -2)...2

...1
...2 => Adding 1 & 2 yields... ...4

(mult. by 2)...2
...3

...2
...3 => Adding 2 & 3 yields......5

(mult. by -5)...4
(mult. by 3)...5

...4
...5 => Adding 4 & 5 yields... =>

Ans: (From text book x = 2, y = 3, z = -1
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June 30th, 2012, 05:20 AM   #2
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Re: Simultaneous Equations

Quote:
Originally Posted by bilano99
Q. Solve the 3 unknowns:
...1
...2
...3
Try again; start by adding together 1 and 3 to get right away: 3x + 2y = 12
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June 30th, 2012, 05:39 AM   #3
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Re: Simultaneous Equations

Quote:
Originally Posted by bilano99
(mult. by -5)...4
(mult. by 3)...5

...4
...5 => Adding 4 & 5 yields... =>
Careful -35 * 3 = -105, not -75
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June 30th, 2012, 05:48 AM   #4
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Re: Simultaneous Equations

D'oh. Silly error. Thank you.
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