Higher November 2018 Unit 1 Q11
11. Using the axes below, find the region which satisfies the following inequalities.
\[\begin{aligned} x &\geqslant -1\\ y + 2x &\leqslant 1\\ y &\geqslant x \end{aligned}\]Make sure that you clearly indicate the region that represents your answer. [3]
| Scheme | Marks | Comments |
|---|---|---|
| Lines \(x = -1\), \(y + 2x = 1\) and \(y = x\) all correct. | B2 | B1 for any 2 correct lines. If \(x = -1\) and \(y = -1\) are both shown, do not award a mark unless \(x = -1\) is selected for the region or clearly labelled. |
| Correct region identified. | B1 | FT provided region is closed and B1 awarded. Accept indication by ‘shading out’. |