Question 1186332
a.

{{{x+2y+3z=11}}}
{{{3x+8y+5z=27}}}
{{{-x+y+2z=2}}}


We can write this system as an augmented matrix:


{{{matrix(3,4,
1,2,3,11,
3,8,5,27,
-1,1,2,2)}}}


b) 


{{{x+2y+3z=11}}}
{{{y-2z=-3}}}
{{{3y+5z=13}}}



{{{matrix(3,4,
1,2,3,11,
0,1,-2,-3,
0,3,5,13)}}}