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2.52.6  Linear system solving: linsolve

linsolve is used to solve a system of linear equations.
linsolve has two arguments: a list of equations or expressions (in that case the convention is that the equation is expression = 0), and a list of variable names.
linsolve returns the solution of the system in a list.
Input :

linsolve([2*x+y+z=1,x+y+2*z=1,x+2*y+z=4],[x,y,z])

Output :

[1/-2,5/2,1/-2]

Which means that

x=−
1
2
y=
5
2
z=−
1
2
 

is the solution of the system :





2x+y+z=1
x+y+2z=1
x+2y+z=4

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