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**Finding an Equation from a Graph**

Hi,

I need to find an equation from a graph.

The graph itself is not very complex. Just need some help.

I cant really show you the graph but I'll give you the points so you can plot it to paste them in to Excel or something.

x co-ords y co-ords

0 0

1 1.5

2 3

3 3

4 3

5 1.5

6 0

7 0

8 0

9 -1

10 -2

11 -2

12 -2

13 -1.5

14 -1

15 -0.5

16 0

Please help . . . your help is much appreciated

Thanks