Suppose the line of best fit is being found for some data points that have an r-value of 0.793. if the standard deviation of the x-coordinates is 5.591, and the standard deviation of the y-coordinates is 2.772, what is the slope of the line to three decimal places?

0.393

Explanation: If the given quantities are r-value (or Pearson's coefficient) and the standard deviations of x and y coordinates, we'll use the following formula for slope:



where:
m = slope of the best fit line
r = r-value = 0.793
= standard deviation of x-coordinates = 5.591
= standard deviation of y-coordinates = 2.772

So, the slope is calculated as follows:



Hence, the slope in 3 decimal places is 0.393.

The coordinates of point a right now is (-3,-1) you have to multiply these coordinates by a factor of 2 to get (-6,-2)

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