Manipulating Formulae/ Changing the Subject: Eduqas GCSE Foundation November 2018 Paper 2 Q21

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Foundation November 2018 Paper 2 Q21

21. Rearrange each of the following to make \(w\) the subject of the formula.

(a) \(\dfrac{7}{w} = e\) [1]

(b) \(3(w + 5) - f = g\) [3]

Scheme	Marks	Comments
\(w = 7/e\)	B1	CAO. Accept \(7/e = w\)

Mark scheme (b)

Scheme	Marks	Comments
\(3w + 15 - f = g\) or \(3w + 15 = f + g\)	B1	FT until 2^nd error occurs
\(3w = f + g - 15\)	B1
\(w = \dfrac{f + g - 15}{3}\)	B1	Mark final answer Alternative method \(w + 5 - f/3 = g/3\) B1 \(w = g/3 + f/3 - 5\) B2 Mark final answer, if further incorrect manipulation, award final B1 not final B2
	(4)