If $x=4$ and $3 x+2 y=30$, what is the value of $y$ ?
(A) 18
(B) 6
(C) 3
(D) 4
(E) 9
Substituting $x=4$ into $3 x+2 y$ we get, $3(4)+2 y=12+2 y$.

Since this expression $12+2 y$ is equal to 30 , then $2 y$ must equal $30-12$ or 18 .

If $2 y=18$, then $y$ is $18 \div 2$ or 9 .

Answer: (E)