## Algebra: A Combined Approach (4th Edition)

c. $y \leq 2x$
The line that separates the shaded region and non-shaded region is $y=2x$. With a given $x$ value, any $y$ value that's less than the $y$ value that's found through the equation $y=2x$ is within the shaded region. Hence $y \leq 2x$.