Question

The variables x and y vary inversely. Use the given values to write an equation relating x and y . Then find y when x=−3 .

x = 1, y = 5
The equation is y =

Answer 1

Explanation:

to vary inversely means that

y = k/x

the opposite would be to vary directly :

y = kx

so, in our case

5 = k/1

k = 5

y = 5/x

therefore, for x = -3

y = 5/-3 = -5/3 = -1.666666666...