What is Analytic Geometry used for?

I just found a book for it and I dont know why its here. Maybe I could get a clue if I knew what it was for

the short answer: saving time and money

I just asked Google, and, from one of the links, I quote:
"Analytic geometry
From Wikipedia, the free encyclopedia.
Analytic geometry, also called coordinate geometry and earlier referred to as Cartesian geometry, is the study of geometry using the principles of algebra. Usually the Cartesian coordinate system is applied to manipulate equations for planes, lines, curves, and circles, often in two and sometimes in three dimensions of measurement. Some consider that the introduction of analytic geometry was the beginning of modern mathematics."