Since there isn't a picture of the graphs, I attached one, of my graph, to this answer.
I'm also assuming (y2 2x+1) is actually (y< 2x+1).
Possible solutions are within the purple section of the attached image.
I hope this is helpful to you.
D. Angle G equals 70 degrees
I think 15 I am not 100 percent on that
Nothing except when it has been polluted