Statistics

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Consider pairs <x,y>,...,<xn,yn> for i=1, ...,n. zi=cxi+d Express b sub(z*x) in terms of b sub(y*x) and a sub(z*x) in terms of a sub(y*x).


I have been stumped on this one for hours! Sub (y*x) means its a subscript. Thank you to anyone who can help :)

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