4 < = x + 4 < = 8.....subtract 4 from all sections 4 - 4 < = x + 4 - 4 < = 8 - 4...simplify 0 < = x < = 4
this would produce a number line with a solid circle on 0 and a solid circle on 4, with shading in between....just like the graph shown in the picture u posted.