Foundation November 2019 Paper 3 Q24
24 In this question, all lengths are in centimetres.
Here is a square.
Not to scale
Find the length of one side of the square when \(b = 4\). [6]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 18 nfww | 6 | B4 for \(2a = 5\) OR M3 for \(6a - 4a = 8 - 4 + 1\) or better or M2 for \(6a + 4 - 1 = 4a + 2 \times 4\) or better or \(6a - 4a = 2b - b + 1\) or better or M1 for \(6a + b - 1 = 4a + 2b\) AND M1dep for correct substitution of 4 and their 2.5 in \(4a + 2b\) or \(6a + b - 1\) | Isolating \(a\) Expect \(6a + 3 = 4a + 8\) Expect \(2a = b + 1\) Dependent on at least M1 or B4 May be implied by 10 + 8 or 15 + 3 |