Manipulating Formulae/ Changing the Subject: WJEC GCSE Higher November 2018 Unit 1 Q13

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Higher November 2018 Unit 1 Q13

13. Rearrange the following formula to make \(c\) the subject. [4]

\[\frac{6c - 3d}{c + 2} = g\]

Mark scheme

Scheme	Marks	Comments
\(6c - 3d = g(c + 2)\)	B1	FT until 2^nd error, provided equivalent difficulty. May be implied by further working.
\(6c - gc = 3d + 2g\)	B1	Includes correct expansion and rearrangement.
\(c(6 - g) = 3d + 2g\)	B1
\(c = (3d + 2g)/(6 - g)\) or equivalent	B1	Mark final answer.