Question 907792
This system is inconsistent.
If you add the first two equations together you get,
4.{{{3a+4b=-1}}}
If you add the last two equations together you get,
5.{{{9a+12b=3}}}
If you multiply eq.4 by {{{3}}}, you get
{{{9a+12b=-3}}}
Compare to eq. 5 and you see the inconsistency.
No solution.