Question 1045647
.
<pre>
x -  y      = 9,   (1)
x -  y + 3z = 2,   (2)
    4y - 3z = 5.   (3).

Distract the eq.(1) from the eq.(2).  You will get 

3z = 2-9 = -7  --->  z = {{{-7/3}}}.

Then from (3), 4y = 5 + 3z = {{{5 +3*(-7/3)}}} = 5-7 = -2  --->  y = {{{-2/4}}} = {{{-1/2}}}.

Then from (1), x = 9 + y = {{{9 + (-1/2)}}} = {{{8}}}{{{1/2}}}.

<U>Answer</U>. x = {{{8}}}{{{1/2}}},  y = {{{-1/2}}},  z = {{{-7/3}}}.
</pre>