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# Coordinate geometry

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1. help..
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2. 15,-3?
3. You can find the gradient of line AD from the points you have. Then you know the gradient of line DC, so you just use the fact that the length of AD=DC and you should be able to work out the coordinates using the coordinate geometry equations.
4. legosass - isn't it much simpler than that? D is the midpoint, so 8-1=7 so 8+7=15 (value of p)
2-7=-5 so 2-5=-3 (value of q)?
5. Or have I done something wrong?
6. Haha, nope, you can do it like that. It all depends on how many marks it is worth and how much working they want to show. In my head I'd do it like that too, but they both get the same answer

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