Which of the following equations is an example of inverse variation between variables x and y ?
a.) y=15x
b.) y= x-15
c.) y=15/x
d.) y=x/15

The option C) y = 15/x

a) y = 15 x is an example of direct variation, with proportionality constant = 15

b) is an example of linear variation (it is the equation of a straight line that does not pass through the origin)

c) y = 15/x => y*x = 15 = constant which is the characteristic of an inverse relation

d) y = x/15 is an example of an inverse relation, with proportion constant = 1/15 

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