<PRE><B>Question 1011120</B>
More ways than just one.  I would try eliminating or substituting for a, using the third-row equation, as {{{a=2-4b-c}}}.  Simplify the resulting system and you will have THREE equations in THREE unknown variables.  


What you do may depend on what skills you are being taught.  Matrices?  Simple linear systems in Elementary/Intro Algebra 1 ?



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Part of but not the whole solution,
{{{system(b=1,d=-2)}}}</PRE>