Edexcel IGCSE Math A 2.3.D formulae from contexts

Practise context-formula questions by assigning letters to quantities, multiplying repeated amounts and writing a single expression or formula.

Exam points

Write a cost or quantity formula from worded information using the stated letters.
Use a number machine or rule to form an expression in the input variable.
Include coefficients and constants correctly when repeated groups or fixed amounts appear.

[Maximum number: 2]

Here is a number machine.

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

Final answer:
7y-9

B2 oe, for example $y\times7-9$ . B1 for 7y, y-9, or y=7y-9.

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