y = -48 (1/x) is the variation equation.
A relationship between a set of values for one variable and a set of values for other variables is known as a variation.
One of the most fundamental concepts in mathematics is the idea of a function, in part because functions are a useful tool for describing and illuminating patterns.
given that
x and y vary inversely that means x = k 1/y or y = k 1/x.
so, x= k(1/y)
xy = k
from the question x=-12 when y=4
-12(4) = k
k = -48
now,
y = K (1/x)
y = -48 (1/x)
This is the variation equation.
Learn more about variation equations from here:
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