User blog comment:Willb32764/Health vs Armor/Magic Resist/@comment-24905320-20140829105446/@comment-24603390-20140831101731

The graphs are based on the most gold efficent way to give you the most effective health. The lines show the most efficent armor/health combo. If your current health and armor lie below the line, buy more health items, if they lie above the line, buy more amor (or magic resist). The equations are formed by comparing the marginal utility between health and armor, and are calculated using some calculus i remember from high school [who says calc isnt useful :-) ]. If you are interested in the method used i can describe it for you.