The constant could be any number.
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The inverse variation is the indirect relationship between two variables. The form of the inverse variation is xy = k where k is any real constant.
The equation is xy = k where k is the constant of variation. It can also be expressed y = k over x where k is the constant of variation.
The equation is xy = 22.5
2=8/4 the constant is 8 y-k/x i think.
if x varies inversely as y then xy is a constant (k) eg if x doubles as y halves then examples are: x = 6, y = any then k = 6y when x = 12, y = any/2 then k = 12/2 times any ie 6y.