Solve the System of Equations by the Substitution Method $\left\{ \begin{array} { l } - 3 x + y = 28 \\- 4 x + 7 y = 77\end{array} \right.$

Multiple Choice

Solve the system of equations by the substitution method.
- $\left\{ \begin{array} { l } - 3 x + y = 28 \\- 4 x + 7 y = 77\end{array} \right.$

A) (-7, 7)
B) (7, -7)
C) (-6, 6)
D) no solution