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    This is the answer for the picture (-3.50--5.27)/(0.00333-0.00294)

    Not sure how the mark scheme got this
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    gradient = change in y over change in x

    You don't have to pick the two points they have, just so long as your points are widely spaced apart (giving you large Dx and Dy values) and the calculated gradient is close to the true value.
 
 
 
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Updated: January 6, 2017

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