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The rate of change is the same as the slope.
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.
Directly proportional relationship is F=ma, F is directly proportional to a. Inversely proportional relationship is v=r/t, v is inversely proportional to t.
The slope of an inverse relationship
It is a straight line equation in the form of: y = mx+b whereas 'm' is the slope and 'b' is the y intercept