Question

How do you find the variation constant and an equation of variation where y varies directly as x and y= 18 when x=2?

Answer 1

Every variation equation is of the form
`y = mx` where `m` is a constant value (it is the same for all pairs `(x,y)` that are valid solutions to the equation)

We are given that
`18 = m xx 2`
which implies
`m=9`

that is the equation of direct variation is
`y=9x`