The problem asks us to simplify the inequality $y \leq -1$ in a rectangular coordinate system. We need to determine if the inequality can be further simplified or if it is already in its simplest form.

1. Problem Description

The problem asks us to simplify the inequality $y \leq -1$ in a rectangular coordinate system. We need to determine if the inequality can be further simplified or if it is already in its simplest form.

2. Solution Steps

The given inequality is $y \leq -1$. This inequality states that the value of $y$ is less than or equal to $-1$. This is already in its simplest form, as there are no like terms to combine or any further operations to perform to isolate $y$.

3. Final Answer

B. The inequality cannot be simplified further.