1MA0 Foundation June 2012 Paper 2 Q21
21 On the grid, draw the graph of \(y = 3x - 2\) for values of \(x\) from \(-1\) to 3 (3)
| Working | Answer | Mark | Notes | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Straight line from (\(-1\), \(-5\)) to (3, 7) | 3 | (Table of values) M1 for at least 2 correct attempts to find points by substituting values of \(x\). M1 ft for plotting at least 2 of their points (any points plotted from their table must be correctly plotted) A1 for correct line between \(-1\) and 3 (No table of values) M2 for at least 2 correct points (and no incorrect points) plotted OR line segment of \(y = 3x - 2\) drawn (ignore any additional incorrect segments) (M1 for at least 3 correct points plotted with no more than 2 incorrect points) A1 for correct line between \(-1\) and 3 (Use of \(y = mx + c\)) M2 for line segment of \(y = 3x - 2\) drawn (ignore any additional incorrect segments) (M1 for line drawn with gradient of 3 OR line drawn with a \(y\) intercept of \(-2\) and a positive gradient) A1 for correct line between \(-1\) and 3 |