x

What does "make a letter the subject" mean?

What does "make a letter the subject" mean?

Flowchart showing p multiplied by 4 then increased by 13 to make z, with reverse arrows subtract 13 then divide by 4 to get p back

A formula links quantities, and the subject is the letter isolated on its own. If a question says "make xxx the subject", your final line should be x=somethingx = \text{something}x=something.

Changing the Subject of a Formula Lesson

  1. IGCSE
  2. /Maths
  3. /Changing the Subject of a Formula

Step-by-step lessons covering CIE IGCSE Maths Changing the Subject of a Formula for Core and Extended tier. Each lesson works through exam-style questions in Paper 1 and Paper 3 (Core) or Paper 2 and Paper 4 (Extended) format. Start with the Core-tier fundamentals in number and algebra before moving on to the more demanding Extended-only topics like calculus-adjacent algebra and advanced trigonometry.

Lessons