https://adamaths.com/forum/
20240050010
https://adamaths.com/forum/viewtopic.php?f=117&t=5822
Page
1
of
1
20240050010
Posted:
Mon Feb 05, 2018 9:37 pm
by
ada
$\begin{align}x+2y-z&=-8\\3x+3y-2z&=-9\\5x-y+7z&=90\end{align}$