Manipulating Formulae/ Changing the Subject: Eduqas GCSE Higher June 2019 Paper 1 Q9

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Higher June 2019 Paper 1 Q9

9. Rearrange \(6(x + y) = 8x - 5\) to make \(x\) the subject. [3]

Mark scheme

Scheme	Marks	Comments
\(6x + 6y = 8x - 5\)	B1	FT until 2nd error; Expands brackets
\(6y + 5 = 8x - 6x\)	B1	FT; collects terms; implies first B1
\(x = \dfrac{6y + 5}{2}\)	B1	FT; divides; mark final answer; final answer may be unsimplified e.g. \(x = \dfrac{-5 - 6y}{6 - 8}\)
	(3)