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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.
a = k/b when a is inversely proportional to b, where k is a constant.
Two quantities are inversely proportional when one is multiplied or divided by any number, the other is divided or multiplied by the same number. The relation is also commonly denoted as: y ∝ x−1 The graph of two variables that are inversely proportional is a hyperbola. Speed and time are inversely proportional because as the speed increases, the time it takes to reach the destination decreases.
If one value of a variable increases as another value of a different variable decreases in a mathematical equation, they are said to be inversely proportional or vary inversely. For example, the strength of the force of gravity decreases as the square of the interacting distance increases, so the strength of gravity is inversely proportional to the square of the distance, or strength ∝ 1/distance2.
x is inversely proportional to y when x = 1/y.