Solve the System of Equations by the Substitution Method $\left\{ \begin{aligned}4 x - 2 y & = 70 \\x & = 3 y\end{aligned} \right.$

Multiple Choice

Solve the system of equations by the substitution method.
- $\left\{ \begin{aligned}4 x - 2 y & = 70 \\x & = 3 y\end{aligned} \right.$

A) $( 7,21 )$
B) infinite number of solutions
C) $( 21,7 )$
D) no solution