For what value of kkk does the system have infinitely many solutions? {x+2y=32x+4y=k\begin{cases} x + 2y = 3 \\ 2x + 4y = k \end{cases}{x+2y=32x+4y=k
k=3k = 3k=3
k=6k = 6k=6
k=9k = 9k=9
k=−6k = -6k=−6