To draw the region that represents the solution of the inequality you have to:
1. draw dashed vertical line [tex]\frac{1}{2}x=18\Rightarrow x=36[/tex] (dashed because of sign of inequality is <, doesn't include notion equal to);
2. shade the region that determines all points on the coordinate plane that have x-coordinate less than 36.
The attached diagram represents the solution set for the given inequality.
