boundary lineA line that divides the coordinate plane into two regions. If points along the boundary line are included in the solution set, then a solid line is used; if points along the boundary line are not included then a dotted line is used.
coordinate plane

A plane formed by the intersection of a horizontal number line called the x-axis and a vertical number line called the y-axis.

system of linear inequalitiesTwo or more linear inequalities with the same variables.