Solve the system using either Gaussian elimination with
back-substitution or Gauss-Jordan elimination. (If there is no
solution, enter NO SOLUTION. If the system has an infinite number
of solutions, express x, y, z, and
w in terms of the parameters t and
s.)
4x
+
12y
−
7z
−
20w
=
20
3x
+
9y
−
5z
−
28w
=
36
(x, y, z, w) = ( )
*Last person who solved this got it wrong