\( f(x)=\frac{x+k}{x-1} \) and \( (5,2) \in f^{-1} \), then \( K= \)

\( 1 \leftarrow \quad \begin{array}{l}\text { Solve the system of equations by the substitution method. } \\ \begin{aligned} 4 x+2 y & =-154 \\ x-5 y & =0\end{aligned}\end{array} \)

\( 1 \leftarrow \quad \begin{array}{l}\text { Determine whether the ordered pair }(3,4) \text { is a solution of the system. } \\ \begin{array}{l}x+y=7 \\ x-y=-1\end{array}\end{array} \)

\( 1 \leftarrow \quad \begin{array}{r}\text { Solve the system of equations by the substitution method. } \\ \begin{aligned} x+y & =-2 \\ y & =-2 x\end{aligned}\end{array} \)

\( 1 \leftarrow \begin{array}{l}\text { Determine whether the ordered pair }(2,6) \text { is a solution of the system. } \\ \begin{array}{l}x+y=8 \\ x-y\end{array}\end{array} \)

\( 1<\quad \begin{array}{r}\text { Determine whether the ordered pair }(4,5) \text { is a solution of the system. } \\ \begin{array}{r}3 x+2 y=2 \\ 2 x+y=3\end{array}\end{array} \)