mathalignment within a table - help needed!

[Alasdair McAndrew <amca01@gmail.com>]

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Hello,

I'm trying to typeset some linear algebra exercises for my students; the
exercises will be within a table, and each second element will be a system
of linear equations.  This sort of thing:

\starttable[|l|M|l|M|]
\NC (a) \NC %

\startmathalignment[n=7,align={right,middle,right,middle,right,middle,right}]
      \NC 3x\NC +\NC 6y\NC -\NC 2z\NC =\NC -13\NR
      \NC -6x\NC -\NC 9y\NC +\NC 5z\NC =\NC 22\NR
      \NC 3x\NC +\NC 3y\NC -\NC 5z\NC =\NC -13\NR
    \stopmathalignment
\NC (b) \NC %

\startmathalignment[n=7,align={right,middle,right,middle,right,middle,right}]
\NC x\NC +\NC 3y\NC +\NC 3z\NC =\NC -4\NR
\NC x\NC +\NC 4y\NC +\NC 5z\NC =\NC -5\NR
\NC 2x\NC +\NC 4y\NC +\NC 3z\NC =\NC -5\NR
\stopmathalignment
\NC\AR
\stoptable

But this doesn't work.  There seems to be a problem with the mathalignment
environment within the table.  What do I need enclose these in so that they
will be treated as displayed equations within the table environment?  I'm
using MkII.

Thanks,
Alasdair

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