Precalculus

A line seems quite simple. What do we mean by a line though, in math?In math, nothing is a material object. And in fact, everything in math is an idea. So a line in math is an idea, too. It's not just an idea though. It has its definition. So what is a line in math?This book is about lines, and in math, we put them in equations, so it covers equations for lines, or equations of degree 1, contains lots of examples in such, and helps get used to algebra and graphs on such equations.This is in fact, a book of examples, so ideas or rules as formulas, identities, etc., or laws or principles are explained through examples.Each example is fully worked out and detailed, together with a summary at each end.So this book helps develop and grow manipulation and calculation technics on equations for lines and their curves, that is, straight lines, and thus, will help strengthen problem-solving skill.