Question

Write an appropriate direct variation equation if y = 18 when x = 2

Answer 1

`y=9x`

Explanation:

we know that

A relationship between two variables, x, and y, represent a direct variation if it can be expressed in the form
`k=(y)/(x)` or
`y=kx`

In this problem we have

y=18 when x=2

Find the value of the constant of proportionality k

`k=(y)/(x)` ---->
`k=(18)/(2)=9`

therefore

The equation is equal to

`y=9x`