GCSE(F),

To plot a straight line, create a small table.

Determine at least three values of *x* to plot, and work out the values of *y* using the equation. Plot the points, and draw a straight line through the three points, extending the graph beyond the two outside points.

If a straight line cannot be drawn through these points, check the calculations.

1. An equation is given by *y* = 3*x* - 4.

What are the coordinates that would be plotted for *x* = -2, *x* = 0 and *x* = 3?

Answer: (-2, -10), (0, -4) and (3, 5)

x | -2 | 0 | 3 |

3x - 4 | -10 | -4 | 5 |

2. Plot the graph for *y* = 2*x* + 4.

Answer:

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