(1) \( \left\{\begin{array}{l}4-4 x=-1 \\ z y-8 x=6\end{array}\right. \)
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Let's first solve the equation \(4 - 4x = -1\). By isolating \(x\), we rewrite it as \(4x = 4 + 1\) which simplifies to \(4x = 5\). Thus, \(x = \frac{5}{4}\). Now substituting \(x\) into the second equation \(zy - 8x = 6\). Plugging in \(x = \frac{5}{4}\) gives us \(zy - 8(\frac{5}{4}) = 6\), which simplifies to \(zy - 10 = 6\). Rearranging yields \(zy = 16\). This means that \(z\) and \(y\) can have multiple combinations that satisfy this equation, such as \(z = 4\) and \(y = 4\), among others. Ultimately, knowing one of these variables allows you to find the other!