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Home > Matrix & Vector calculators > Solving systems of linear equations using Elimination method example
7. Elimination method example ( Enter your problem )
( Enter your problem )
  1. Example `2x+5y=21,x+2y=8`
  2. Example `2x+5y=16,3x+y=11`
  3. Example `2x+3y-z=5,3x+2y+z=10,x-5y+3z=0`
  4. Example `x+y+z=3,2x-y-z=3,x-y+z=9`
 		Other related methods
  1. Inverse Matrix method
  2. Cramer's Rule method
  3. Gauss-Jordan Elimination method
  4. Gauss Elimination Back Substitution method
  5. Gauss Seidel method
  6. Gauss Jacobi method
  7. Elimination method
  8. LU decomposition using Gauss Elimination method
  9. LU decomposition using Doolittle's method
  10. LU decomposition using Crout's method
  11. Cholesky decomposition method
  12. SOR (Successive over-relaxation) method
  13. Relaxation method
3. Example `2x+3y-z=5,3x+2y+z=10,x-5y+3z=0`
(Previous example)		8. LU decomposition using Gauss Elimination method
(Next method)

4. Example `x+y+z=3,2x-y-z=3,x-y+z=9`


Solve Equations x+y+z=3,2x-y-z=3,x-y+z=9 using Elimination method

Solution:
Total Equations are `3`

`x+y+z=3 -> (1)`

`2x-y-z=3 -> (2)`

`x-y+z=9 -> (3)`


Select the equations `(1)` and `(2)`, and eliminate the variable `y`.

`x+y+z=3`` xx 1->````x``+``y``+``z``=``3```
+
`2x-y-z=3`` xx 1->````2x``-``y``-``z``=``3```
```3x``=``6`` -> (4)`



Select the equations `(1)` and `(3)`, and eliminate the variable `y`.

`x+y+z=3`` xx 1->````x``+``y``+``z``=``3```
+
`x-y+z=9`` xx 1->````x``-``y``+``z``=``9```
```2x``+``2z``=``12`` -> (5)`



Now use back substitution method
From (4)
`3x=6`

`=>x=(6)/(3)=2`

From (5)
`2x+2z=12`

`=>2(2)+2z=12`

`=>2z+4=12`

`=>2z=12-4=8`

`=>z=(8)/(2)=4`

From (1)
`x+y+z=3`

`=>1(2)+1y+1(4)=3`

`=>1y+6=3`

`=>1y=3-6=-3`

Solution using Elimination method.
`x=2,y=-3,z=4`



This material is intended as a summary. Use your textbook for detail explanation.
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3. Example `2x+3y-z=5,3x+2y+z=10,x-5y+3z=0`
(Previous example)		8. LU decomposition using Gauss Elimination method
(Next method)


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