Don answer is correct.
It because the inequality has a symbol , which means that the boundary is a dotted line. \ \
Since, diego is represents the graph of the inequality with a solid line.
Hence Don is correct.
Don is correct.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ba91674b63ca325d108cf6dbe044239f.png\")
, which means that the boundary is a dotted line. \ \
![\"\"](\"/userfiles/image/steps_images/solution.JPG\")