Foundation November 2021 Paper 2 Q23
23 The diagram shows a straight line crossing two parallel lines.
Not to scale
Find the value of \(y\).
You must show your working. [6]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 40 with correct working | 6 | M1 for \(x + 85 = 2x + 30\) M1dep for \(\pm x = k\) or \(kx = \pm 55\) (\(k \ne 0\)) A1 for \(x = 55\) or M1 for at least two trials of \(x + 85\) or evaluated for \(x = 55\) M1 for at least two trials of \(2x + 30\) or evaluated for \(x = 55\) A1 both expressions evaluated as 140 when \(x = 55\) AND M1 for their \(x + 85\) or \(2 \times\) their \(x + 30\) M1 for \(y = 180 - (\)their \(x + 85)\) oe If 0 scored SC2 for answer 40 with no working or insufficient working or SC1 for \(x = 55\) with no or insufficient working | “Correct working” requires evidence of at least M1 AND M1 i.e. we expect to see a minimum of an equation or trials leading to \(x = 55\) and the substitution |