1. Equation of a line in two dimensions
Chapter 14
Equation of a line in two dimensions

2. Descartes

3. Can studying a graph provide the same level of mathematical rigour?
TOK
René Descartes is credited with linking equations from geometry problems to graphs of curves so that one can be used to solve the other. However, working with algebra and equations provides an element of certainty. Algebraic methods lead to the exact solution or solutions. They are rigorous.
Can studying a graph provide the same level of mathematical rigour?