EliC
solve the system
x1+X2 x3 +x4 =5
3x1 +x2 =5x4=2
2x1 + 1/2 x2 x3= 2



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kashbmaryd
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are you talking about x^2 or 2x on the first line?

UsukiDoll
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augmented matrix

UsukiDoll
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write it in augmented matrix form and then use the Gaussian method to get into echelon form

UsukiDoll
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after that use Guass Jordan (row reduced echleon form)

UsukiDoll
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dw:1361520164481:dw

UsukiDoll
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dw:1361520243815:dwwe have some numbers below the main diagonal. we need to get rid of them

UsukiDoll
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3r1+r2 > r2
2r1+r3 > r3

UsukiDoll
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dw:1361520296588:dw

UsukiDoll
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dw:1361520348370:dw

UsukiDoll
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dw:1361520395578:dw

UsukiDoll
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dw:1361520453895:dw

UsukiDoll
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dw:1361520485980:dw

UsukiDoll
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dw:1361520642615:dw

UsukiDoll
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dw:1361520682113:dw

UsukiDoll
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dw:1361520706134:dw

UsukiDoll
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3r22r3 >r3

UsukiDoll
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dw:1361520750768:dw

UsukiDoll
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dw:1361520816538:dw

UsukiDoll
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dw:1361520917543:dw