(y2 - y1) / (x2 - x1)
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Y=mX+b
It is the formula for a straight line with a slope of 3.6.
A linear relationship means that the slope of the line is proportional, which means that the line is straight. In contrast to the linear realtionship, the non-linear relationship's slope is not proportional and the line will curved and not straight. Formula of calculating the slope is the difference of y divided by the difference of x.
Slope of a straight line is the same at all points on the line, whereas for a curved line it changes.
The formula for finding the slope of the line is this: m = (Y2-Y1)/(X2-X1)