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Edexcel IGCSE Math A 2.3 expressions and formulae

Use this formulae page to turn contexts into algebra, substitute given values and make a specified variable the subject of a formula.

Syllabus
First assessment 2018
Course
Math A 4MA1
Level
Foundation

Exam points

  • Write formulae from contexts such as total cost, number machines or sequence rules.
  • Substitute values into an expression or formula before simplifying the result.
  • Rearrange formulae to make a named variable the subject with correct inverse operations.

Covered syllabus points

2.3.A Unknowns and variables2.3.B Correct notational conventions for algebraic2.3.C Substitution in expressions and formulae2.3.D Formulae from mathematics and other real-life contexts2.3.E Derive a formula or expression2.3.F Changing the subject of a formula

2.3 Expressions and formulae question 1

[Maximum number: 1]

Simplify b×c×7b \times c \times 7

2.3 Expressions and formulae question 2

[Maximum number: 2]

Work out the value of P when y=-3 and w=2

P=

2.3 Expressions and formulae question 3

[Maximum number: 2]

Here is a number machine.

Figure for Question 2.3 Expressions and formulae question 3 — Edexcel IGCSE Math A Foundation

Find an expression, in terms of y, for the output.

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