1. The problem states: "b) y is not given," which means we need to understand or find the value or expression for $y$ when it is not explicitly provided. 2. In algebra or functions, if $y$ is not given, it usually means we need to express $y$ in terms of other variables or parameters, or find $y$ from an equation or context. 3. Without a specific equation or context, we cannot find a numeric value for $y$. Instead, we can state that $y$ is an unknown variable or dependent variable. 4. If you have an equation or function involving $y$, please provide it so we can solve or express $y$ accordingly. 5. Summary: Since $y$ is not given, $y$ remains an unknown or needs more information to be determined.