For what values of kkk does the system {x+ky=2kx+y=2\begin{cases} x + ky = 2 \\ kx + y = 2 \end{cases}{x+ky=2kx+y=2 have a unique solution?
k≠±1k \neq \pm 1k=±1
k≠1k \neq 1k=1
k≠−1k \neq -1k=−1
All values of kkk