to find the ordered pairs within a solution set of a system of linear inequalities, we look at the part of the graph that contains the ouputs of both linear inequalities. so the darkest shaded part of the graph is the solution set. and the dark blue line is included in the solution set because the inequality was "greater than or equal to" while the red line is not included because it is only "less than." the ordered pairs in A show up either on the blue line or within the darkest shaded region which makes them all a part of the solution set of the linear inequalities. hope this made sense.
