how do you graph xy<12?
i can't find any examples in my book .
I suppose you could do this:
Transform xy<12 to y<12/x.
Sketch the graph y = 12/x, a hyperbola if I am correct.
Change your curves to dotted boundaries.
Select some test points to find regions where xy<12.
Shade the areas for which xy<12.
I think you will have a two-dimensional graph at the end.