Graph the line using the slope and y-intercept. If the sign is greater/less than or equal to, the line will be solid (to include the points on the line). If it is just greater or less than, the line will be dashed. If the sign is "less than" (<) the part of the graph that contains data points less than the line will be shaded. Vise versa, if the sign is "greater than" (>) shade the part of the graph that has the points greater than the line.
hope this helps!