Question

Suppose y varies directly with x, and y = 40 and x = 5 What is the value of y when x = 2?

Answer 1

We have the next information

y varies directly with x

y=40, x=5

in order to know the constant of variation we have

40=k(5)

k=40/5

k=8

so the equation of direct variation is

y=8x

so if x=2

y=8(2)=16

y=16