Question 1072998
{{{-2x+y+6z=1}}}
{{{4x+2z=18}}}
{{{x-y+z=3}}}
.
.
.


{{{A=(matrix(3,3,
-2,1,6,
4,0,2,
1,-1,1))}}}
{{{x=(matrix(3,1,x,y,z))}}}
{{{b=(matrix(3,1,1,18,3))}}}