The direct variation formula is
.
(Substitute
)
(Multiply:
)
Apply division property of equality: If a = b then
.
(Divide each side by 9)
(Cancel common terms)
(Divide:
)
The direct variation equation is
.
Substitute
in direct variation equation.

Apply division property of equality: If a = b then
.
\
(Divide each side by negative 6)
(Cancel common terms)
(Divide:
)
The value of
.