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

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1. kashbmaryd

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

2. UsukiDoll

augmented matrix

3. UsukiDoll

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

4. UsukiDoll

after that use Guass Jordan (row reduced echleon form)

5. UsukiDoll

|dw:1361520164481:dw|

6. UsukiDoll

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

7. UsukiDoll

3r1+r2 ---> r2 2r1+r3 ---> r3

8. UsukiDoll

|dw:1361520296588:dw|

9. UsukiDoll

|dw:1361520348370:dw|

10. UsukiDoll

|dw:1361520395578:dw|

11. UsukiDoll

|dw:1361520453895:dw|

12. UsukiDoll

|dw:1361520485980:dw|

13. UsukiDoll

|dw:1361520642615:dw|

14. UsukiDoll

|dw:1361520682113:dw|

15. UsukiDoll

|dw:1361520706134:dw|

16. UsukiDoll

3r2-2r3 -->r3

17. UsukiDoll

|dw:1361520750768:dw|

18. UsukiDoll

|dw:1361520816538:dw|

19. UsukiDoll

|dw:1361520917543:dw|