本题目来源于试卷: Systems of Equations，类别为 IB数学
[问答题]
Consider the following system o pf49 i8nt,k;xm)gt qu 7 6a-oxyfcy8rf 1tk*jj+lf 7 huequations:
$\begin{aligned}
x+y+z & =-1 \\
4 x+2 y+z & =3 \\
9 x+3 y & =p
\end{aligned}$
where $p \in \mathbb{R} $.
1. Show that this system does not have a unique solution for any value of p .
2. 1. Determine the value of p for which the system is consistent.
2. For this value of p , find the general solution of the system.
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