Foundation November 2018 Paper 2 Q14
14 Lee wants to draw the graph of \(\quad y = x \quad\) for values of \(x\) from \(-5\) to 5
Here is his graph.
Make two different criticisms of his graph. [2 marks]
Criticism 1
Criticism 2
| Answer | Mark | Comments |
|---|---|---|
| The graph only goes from \(x = -4\) to \(x = 4\) and the graph shown is \(y = -x\) up to 0 | B2 | oe B1 one correct criticism SC1 correct graph drawn from \(x = -5\) to \(x = 5\) |
Additional guidance
| For one criticism, accept eg it doesn’t reach 5 / 5 not plotted / it doesn’t start at –5 only starts at –4 / only reaches 4 it should go to (5, 5) / (5, 5) not plotted / (–5, –5) not plotted it isn’t long enough | B1 |
| Do not accept eg it isn’t finished (–5, 5) not plotted | B0 |
| For the other criticism, accept eg it’s the wrong line up to 0 it’s the wrong equation for the first part \(y\) does not equal \(x\) at the beginning it should go through (–4, –4) / (–5, –5) not plotted / (–1, –1) should be plotted it should be / it’s not a straight line it shouldn’t be a V-shape worked out the negative numbers wrong / no negative \(y\)-coordinates he should have plotted … and correct table of values | B1 |
| Do not accept eg it isn’t correctly drawn / it isn’t \(y = x\) / the points are plotted wrong it should be symmetrical / it shouldn’t be symmetrical one line should go below the \(x\)-axis | B0 |
| NB (–5, –5) should be plotted is valid for either (but not both) criticisms | B1 |
| Both criticisms may be in one answer space | |
| Ignore irrelevant statements but any additional statements must be correct eg It goes from –4 to 5 not –5 to 5 | B0 |