What is substitution?
- Substitution is where we replace letters in a formula with their values
- This allows you to find one other value that is in the formula
How do we substitute?
- Write down the FORMULA if not clearly stated in question
- SUBSTITUTE the numbers given – use ( ) around negative numbers
- SIMPLIFY if you can
- REARRANGE if necessary – it is usually easier to substitute first
- Do the CALCULATION – use a calculator if allowed