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ikamu19 ikamu19
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12 years ago
4x+8y+z=2
x+7y-3z=-14
2x-3y+2z=3

Im about to punch a hole in my wall it is driving me insane, i do know how to do them in 2 equations but not 3
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#1
12 years ago
Ah, it isn't that hard. You basically take the top two equations and eliminate one of the variables, like z for example. Then you do the same with the bottom two and eliminate the same variable(yes, you use the middle equation twice). Now you have 2 two variable equations and you solve these as normal to get your x and y variables and then input those two values in to one of the original equations to find z. Hope this helps!
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SmilerSmiler
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12 years ago
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#3
12 years ago
I wonder if you've ever heard about Cramer's rule.
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