An inverse proportion between two variables is when the value of one variable increases, the other decreases. Mathematically, this is shown as:
x = k / yn
where x and y are the two variables, and k and n are constants.
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Inverse is the opposite of proportion
The two variables are in inverse proportion and, graphically, will form a hyperbola.
hyperbola
direct
Inverse proportion implies xy = c where c is the constant of [inverse] proportionality. x = 2 and y = 36 implies xy = 72 = c So the relationship is xy = 72 Then, if x = 4, y = 72/x = 72/4 = 18