Principles and Standards for School Mathematics
Use mathematical models to represent and understand quantitative relationships
Expectations (6 - 8)
model and solve contextualized problems using various representations, such as graphs, tables, and equations.
Expectations (9 - 12)
identify essential quantitative relationships in a situation and determine the class or classes of functions that might model the relationships;
use symbolic expressions, including iterative and recursive forms, to represent relationships arising from various contexts;