Solve the System by the Method of Substitution $$\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 25 \\3 x - 4 y = 0\end{array} \right.$$

Multiple Choice

Solve the system by the method of substitution.
$$\left\{ \begin{array} { l } x ^ { 2 } + y ^ { 2 } = 25 \\3 x - 4 y = 0\end{array} \right.$$

A) $( 4,3 ) , ( - 4 , - 3 )$
B) $( 4,3 )$
C) $( 4,3 ) , ( - 4,3 ) , ( - 4 , - 3 ) , ( 4 , - 3 )$
D) $( 3,4 ) , ( 3 , - 4 )$
E) no real solution