16 a of a number and just C1 2 C1 for clear explanation of the difference M ‘I think double it’ x means an expression of 2x, where is the number I thought of still unknown – at the moment. of a number and double it the ‘I think – answer is has a solution that I know 12’ is 6. b i B1 B1 cao One ii B1 B1 a correct example p e.g. 10 = + 3 iii C1 C1 a clear explanation p Because each solution is = 7. 4
16 a b i ii iii ‘I think of a number and double it’ just means an expression of 2x, where x is the number I thought of – still unknown at the moment. ‘I think of a number and double it – the answer is 12’ has a solution that I know is 6. One e.g. 10 = p + 3 Because each solution is p = 7. C1 B1 B1 C1 2 C1 for clear explanation of the difference B1 cao B1 a correct example C1 a clear explanation M 4
Higher_Skills_Algebra_MarkScheme_Edexcel.docx