Mathematics · Oct / Nov 2020 · Paper 21 · Question 17
0580
As printed in the paper
Show the answer and mark scheme
17(a)[2]
[a =] 7 [2]
M1 for 3(–2)2 + a = 19 or better
17(b)(i)[2]
6x – 9 or 3(2x – 3) final answer [2]
M1 for 2(3x – 8) + 7 or better
17(b)(ii)[2]
x − 7 final answer 2 [2]
M1 for a correct first step x = 2 y + 7 or y − 7 = 2 x y 7 or = x + 2 2
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