vertical change to the horizontal change between any two points on the line.
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The slope of the trend line is the rate of change of the data. It is the ratio of the change of the dependent variable to the rate of change of the independent variable. Slope represents the value of the correlation.
It is the slope.
A line with slope of zero is horizontal. A line with no slope is vertical because slope is undefined on a vertical line.
The lines below are perpendicular. If the slope of the green line is -1, what is the slope of the red line?
Direct proportionality. Their graph would be a straight line through the origin, with the slope equal to the ratio.