Solve the System of Equations by Using Substitution $$\left\{ \begin{array} { l } 5 x + 3 y = 80 \\2 x + y = 30\end{array} \right.$$

Solve the system of equations by using substitution.
- $$\left\{ \begin{array} { l } 5 x + 3 y = 80 \\2 x + y = 30\end{array} \right.$$

A) $x = 0 , y = 0$
B) $x = 10 , y = 10$
C) $x = 0 , y = 10$
D) $x = 10 , y = 0$