Which inequality has the solution region below the line (y=4)?

Correct answer: \(y \leq 4\)

The line \(y=4\) is horizontal. For every point on or below it, the \(y\)-coordinate is less than or equal to 4, so \(y \leq 4\) is correct. Although \(y<4\) would represent only the region strictly below the line, it would not include the line itself; \(\leq\) includes the boundary line. Exam tip: For the region below a horizontal line \(y=a\), use \(y\leq a\).