Solve the System Using Gaussian Elimination or Gauss-Jordan Elimination $\begin{array} { l } 3 x + 2 y + 7 z = 38 \\9 x + 6 y + 21 z = 114 \\0.6 x + 0.4 y + 1.4 z = 7.6\end{array}$

Multiple Choice

Solve the system using Gaussian elimination or Gauss-Jordan elimination.
- $\begin{array} { l } 3 x + 2 y + 7 z = 38 \\9 x + 6 y + 21 z = 114 \\0.6 x + 0.4 y + 1.4 z = 7.6\end{array}$

A) { }
B) { ( x , y , z ) | 3 x +2 y +7 z = 38 }
C) $\{ ( -1,-4,7 ) \}$
D) $\{ ( 1,4,-7) \}$