Question 1132225
Where is your inequality?
The reference line is made by replacing the inequality symbol with an equality symbol.  You use then a dotted line for a strict inequality, or a solid line for an inclusive inequality.


The half-plane which contains the solution points is the one which is given the shading or the cross-hatching.


For some general linear inequality with as {{{Ax+By>=C}}} , this has also an inequality {{{y>=-Ax/B+C/B}}}.  This line cuts the plane into two half-planes.
Pick any point  (h,k) in either half-plane.  If it satisfies the inequality, then the halfplane it is from is the solution for the inequality.  Otherwise, the other half-plane of points is the solution.