The equations of 2 regression lines are

8x - 10y + 66 = 0 , 40x - 18y - 214 = 0

Obtain the standard deviation of Y is standard deviation of X is 3

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- Jan 2nd 2010, 11:49 PMAthenaThe eq of 2 regression lines are
The equations of 2 regression lines are

8x - 10y + 66 = 0 , 40x - 18y - 214 = 0

Obtain the standard deviation of Y is standard deviation of X is 3 - Jan 3rd 2010, 01:17 PMpickslides
Your 2 equations $\displaystyle 8x - 10y + 66 = 0 , 40x - 18y - 214 = 0$ need to be put in the form $\displaystyle y=a+bx $ as this form helps us identify parameters like the standard deviation and the mean.

Note that for $\displaystyle y=a+bx $

$\displaystyle b = r\times \frac{s_y}{s_x}$

$\displaystyle a = \bar{y} -b\bar{x}$

so do you have any additional information?