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Coded regression lines? S1 watch

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1. Hi,

I've just worked out a regression line of Y on X using data in a question, to get the equation Y = 1.28X - 4.2 and am now meant to use coding to find the regression line of y on x.

The codes I've been given are: X = x - 200 and Y = y - 130

I really have no idea how to get the answer, can anyone help? The book says the answer is y = 1.28x - 130

Thank you
2. perhaps im wrong but wouldnt substituting X =x-200 and Y = y-130 into the first eqn Y = 1.28X - 4.2 provide the answer?
3. (Original post by GHOSH-5)
perhaps im wrong but wouldnt substituting X =x-200 and Y = y-130 into the first eqn Y = 1.28X - 4.2 provide the answer?
That's what I thouht, but that's not the answer in the book..
4. well doesnt what i suggested give y=1.28x - 130.2

the bit in bold rounded up to 3.s.f. gives the answer you told us? the book may have rounded up...

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