21 5 M1 = a 3b or = (a 3b) – – M1 = b + (a 3b) or = a + (a 3b) or – – = 2a 2b – M1 two of = b + (a 3b) or = a + (a 3b) or = 2a 2b – – – M1 simplification to enable comparison of 2 of , and e.g. 2 of (a b) , (a b) and 2(a b) – – – C1 completes proof with reference to 2 of , and parallel and a common point
21 5 M1 = a – 3b or = (a – 3b) M1 = b + (a – 3b) or = a + (a – 3b) or = 2a – 2b M1 two of = b + (a – 3b) or = a + (a – 3b) or = 2a – 2b M1 simplification to enable comparison of 2 of , and e.g. 2 of (a – b) , (a – b) and 2(a – b) C1 completes proof with reference to 2 of , and parallel and a common point
17748_10b-Mock-papers-set-1-Paper-2H-mark-scheme.docx