1. **Problem:** Solve $\sqrt{y} = 4$. 2. **Formula:** To solve $\sqrt{y} = 4$, square both sides to remove the square root: $\left(\sqrt{y}\right)^2 = 4^2$. 3. **Work:** $$y = 16$$ 4. **Check:** Substitute $y=16$ back into the original equation: $$\sqrt{16} = 4$$ True, so $y=16$ is the solution. This is the first problem solved completely.