For what value of kkk does this system have infinitely many solutions? {2x−3y=54x−6y=k\begin{cases} 2x - 3y = 5 \\ 4x - 6y = k \end{cases}{2x−3y=54x−6y=k
k=5k = 5k=5
k=10k = 10k=10
k=2.5k = 2.5k=2.5
k=20k = 20k=20