Answer:
constant of variation = 6
Step-by-step explanation:
Direct variation formula:
[tex]y = kx[/tex]
where 'k' is the constant of variation. Therefore,
[tex]k = \frac{y}{x} [/tex]
Substitute the given value of x and y to find the constant of variation.
[tex]k = \frac{18}{3} = 6[/tex]
Hence, 6 is the constant of variation.