C.2.2—Changing the subject of equations

Change the subject of equations, including non-linear equations such as rearranging E = mc².

Use c.2.2—changing the subject of equations to connect the rule to the data and decision in the question.

This matters because c.2.2—changing the subject of equations determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply c.2.2—changing the subject of equations to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: use the formula and units given in the question, show the substitution and interpret the result; the calculation alone is not the conclusion.