C.3.3—Linear relationships

Understand that y = mx + c represents a linear relationship and compare physical equations with that form.

Use c.3.3—linear relationships to connect the rule to the data and decision in the question.

This matters because c.3.3—linear relationships determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply c.3.3—linear relationships to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: C.3.3—Linear relationships is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.