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Equation of line of regression

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Please find attached problem and excel worksheet that relates.

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(a) The regression line of y on x for n pairs of data has the equation .

If the data is coded by means of the relations:

what restrictions, if any, must be placed on and to ensure that the value of the regression coefficient b is unaffected?

(b) The lengths (x) in millimetres and weights (y) in grams of a sample of 157 lima beans were recorded. The results are tabulated in the frequency table within excel. Find the correlation coefficient for this data and determine both regression lines.

Please see Excel spreadsheet for table.
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Equation of line of regression with lima beans weight and length of beans

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