When you draw a line through the. Plot and label 2 points on the line anywhere on the line. In the Chart Editor that pops.
Finding the slope of a loglog plot using ratios.
Click the Chart icon. The value of m is the slope of the graph. For example if the slope is and one point is 54 draw a point at 54 then draw other points along the line by counting to the left 4 and down 3. Remember that the slope of a line never changes so you can choose whatever 2 points you want.