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1. Here is a question I have:

So obviously the gradient equals the change in over the change in .

If I do that I get a different answer to the one in the book, which is but how do I get that answer?

Thanks!
2. Change in y is 2p+2
Change in x is -p-1

Factorise and cancel.
3. Do difference in y/difference in x as you suggest, then look at factorising the top and bottom.
4. (Original post by electriic_ink)
Change in y is 2p+2
Change in x is -p-1

Factorise and cancel.
But I thought the change in y for example was:

In which case y would be -2p -2...
5. (Original post by Dededex)
But I thought the change in y for example was:

In which case y would be -2p -2...
You just subtracted the coordinates the other way round. It doesn't make any difference what way you do them.
6. (Original post by electriic_ink)
You just subtracted the coordinates the other way round. It doesn't make any difference what way you do them.
So I get P + 1 on the denominator but how does that cancel with -2p-2?
7. (Original post by Dededex)
So I get P + 1 on the denominator but how does that cancel with -2p-2?
That's correct.

Note that -2p-2 = -2(p+1).
8. (Original post by electriic_ink)
That's correct.

Note that -2p-2 = -2(p+1).
Aah shizen - yes I see...

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