Determine the value of the scalar kkk such that k(2468)=(1234)k \begin{pmatrix} 2 & 4 \\ 6 & 8 \end{pmatrix} = \begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}k(2648)=(1324).
k=2k = 2k=2
k=1k = 1k=1
k=0.5k = 0.5k=0.5
k=−1k = -1k=−1