The scatter graph shows the height, h cm, and inseam leg measurement, l cm, of six adults.

Question:

The scatter graph shows the height, h cm, and inseam leg measurement, l cm, of six adults. A line of best fit has been added to the scatter graph.


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a. Use two points on the scatter graph to calculate the gradient of the line.


b. Use your answer to part a to write a linear model relating height and inseam in the form l = kh, where k is a constant to be found.


c. Comment on the validity of your model for small values of h.

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