Solve the System by the Method of Substitution $$\left\{ \begin{aligned}x ^ { 2 } + y ^ { 2 } & = 625 \\7 x - 24 y & = 0\end{aligned} \right.$$

Multiple Choice

Solve the system by the method of substitution.
$$\left\{ \begin{aligned}x ^ { 2 } + y ^ { 2 } & = 625 \\7 x - 24 y & = 0\end{aligned} \right.$$

A) $( 24,7 ) , ( - 24 , - 7 )$
B) $( 24,7 )$
C) $( 24,7 ) , ( - 24,7 ) , ( - 24 , - 7 ) , ( 24 , - 7 )$
D) $( 7,24 ) , ( 7 , - 24 )$
E) no real solution