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Tangents

Imaan

Imaan

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Hey I know I sound like a baby LOL :$ , but can someone please help explain me how to work the gradient of a tangent? I am doing one from this paper, question 2 and (c). I drew my line at x = -4 but can't come right with the gradient.
If you want I can take a photo of it, instead of the person having to plot all the points again.

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w12_qp_41.pdf

The answer sheet says from 6 to 11.

Thanks
 
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