Answer:
[tex]y=9x[/tex]
Step-by-step explanation:
we know that
A relationship between two variables, x, and y, represent a direct variation if it can be expressed in the form [tex]k=\frac{y}{x}[/tex] or [tex]y=kx[/tex]
In this problem we have
y=18 when x=2
Find the value of the constant of proportionality k
[tex]k=\frac{y}{x}[/tex] ----> [tex]k=\frac{18}{2}=9[/tex]
therefore
The equation is equal to
[tex]y=9x[/tex]
