Use Matrices to Solve the System of Equations (If Possible)

Multiple Choice

Use matrices to solve the system of equations (if possible) .Use Gaussian elimination with back-substitution or Gauss-Jordan elimination.

A) (19a + 105, -3a - 17, a) where a is any real number
B) (-9a - 11, -7a - 35, a) where a is any real number
C) (-12a + 96, -12a + 37, a) where a is any real number
D) (-125a + 105, 6a - 17, a) where a is any real number
E) (-17a - 33, 6a - 17, a) where a is any real number