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Construction of a line joining two points. You can move this line around and display its equation.

The general equation of a straight line is given in the form y = mx+b where m stands for the gradient (slope).

**Click **once to set the position of the first point then **drag **the mouse to draw a line.**Click **and **drag **the line you just created.

- To illustrate the relationship between the equation of a straight line and its graph.
- To show that the slope doesn’t change when the line is moved.