Substitution Wjec-Eduqas Higher

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Exam code:C300

Substitution

What is substitution?

Substitution means replacing a letter (variable) in a formula with a given number

How do I substitute numbers into a formula?

Write down the formula
Replace (substitute) the letters in the formula with the given numbers
- If substituting in a negative number, it is important to put brackets around it
  - For example, (-3)
Simplify any numerical calculations
Calculate the final value
Sometimes the result is an equation which you can then solve

Examiner Tips and Tricks

On your calculator, don’t forget to type out brackets around any substituted negative numbers!

Worked Example

(a )Find the value of the expression $2 x open parentheses x plus 3 y close parentheses$ when $x equals 2$ and $y equals negative 4$ .

Substitute the numbers given
Use brackets () around negative numbers

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Maths Gcse Wjec-Eduqas Higher