A variable, Y, is inversely proportional to another variable, X if XY = k for some positive constant k.
An equivalent formulation is Y = k/X.
What this means is that if you double X, then Y is halved. If you treble X then Y is reduced to a third etc.
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A = K / b
* *It is the reverse of the actionEx.Addition is the inverse of subtrationmultiplication is the inverse of division
X is proportional to 1/Y
It is zero, by definition of additive inverse!
0. By the definition of "additive inverse", the sum of ANY number and its additive inverse must be 0.