Solve the System of Linear Equations for S, T, and U

Multiple Choice

Solve the system of linear equations for s, t, and u.
6s - 7t + 4u = 19
7s + 6t + 4u = -21
7s - 8t + 2u = 19

A) (1, -3, -1)
B) (-1, 1, -3)
C) (-3, -1, 1)
D) (-1, -3, 1)