Foundation June 2019 Paper 2 Q21
21 On the grid below, draw the graph of \(y = 2x - 3\) for values of \(x\) from \(-2\) to 4 (3)
| Answer | Mark | Mark scheme |
|---|---|---|
| Graph | B3 | for a correct line between \(x = -2\) and \(x = 4\) |
| (B2 | for a correct straight line segment through at least 3 of \((-2, -7), (-1, -5), (0, -3), (1, -1), (2, 1), (3, 3), (4, 5)\) or for all of these points plotted but not joined OR for a line drawn with a positive gradient through \((0, -3)\) and clear intention to use a gradient of 2, eg line through \((0,-3)\) going across 2 squares and up 4 squares ) | |
| (B1 | for at least 2 correct points stated or plotted OR for a line drawn with a positive gradient through \((0, -3)\) OR a line with gradient 2) |
Additional guidance
For B2: Ignore any incorrect points. Points need not be plotted for a correct line (segment) drawn
Table of values
| \(x\) | \(-2\) | \(-1\) | 0 | 1 | 2 | 3 | 4 |
|---|---|---|---|---|---|---|---|
| \(y\) | \(-7\) | \(-5\) | \(-3\) | \(-1\) | 1 | 3 | 5 |
For B1: Ignore any incorrect points
Coordinates may be in a table or in working