Solve the System by the Substitution Method $$\begin{array} { l } y = 10 x - x ^ { 2 } \\2 x - y = - 15\end{array}$$

Multiple Choice

Solve the system by the substitution method.
- $$\begin{array} { l } y = 10 x - x ^ { 2 } \\2 x - y = - 15\end{array}$$

A) $( 3,21 ) , ( 5,25 )$
B) $( 3,5 )$
C) $( - 3,9 ) , ( - 5,5 )$
D) $( 5,25 )$