C.3.9—Graphical calculus concepts

Apply concepts underlying calculus without explicit differentiation or integration by solving rate-of-change equations graphically or with spreadsheet modelling.

Use c.3.9—graphical calculus concepts to connect the rule to the data and decision in the question.

This matters because c.3.9—graphical calculus concepts determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply c.3.9—graphical calculus concepts to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: C.3.9—Graphical calculus concepts is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.