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Question 928190: 
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x + 2y + z = -1
x - y + z = 3
x + y = 4
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put the system of linear equations into standard form
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x + 2y + z = -1
x - y + z = 3
x + y = 4
---
copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = 5.3333333
y = -1.3333333
z = -3.6666667
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system matrix
1 2 1
1 -1 1
1 1 0
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inverse of system matrix
-0.33333333 0.33333333 1
0.33333333 -0.33333333 0
0.66666667 0.33333333 -1
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determinant of system matrix = 3
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Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
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Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
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Solve systems of linear equations up to 6-equations 6-variables:
https://sooeet.com/math/system-of-linear-equations-solver.php
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