You take 2 points from that graph, preferably one on the y axis. Use the equation y-y/x-x. that is your slope. Put that in your slope intercept form which is y=mx+b(M is slope and b is your y intercept). plug take that y intercept point and place the number that isn't 0 in b. Then change the = sign to either a <,>, or ≥, ≤ depending on if the line is dotted or not and if you plug in any point that isn't on the line into the equatuon, if you get something correct like let's say I use 0,0, then if I get 0<1 then u shade the area with 0,0 on it.