Using Cramer's Rule for the system (111−1)(xy)=(20)\begin{pmatrix} 1 & 1 \\ 1 & -1 \end{pmatrix} \begin{pmatrix} x \\ y \end{pmatrix} = \begin{pmatrix} 2 \\ 0 \end{pmatrix}(111−1)(xy)=(20), what is the value of yyy?
111
000
222
−1-1−1