Question 834501
Point-Slope Equation Form might be best choice.  Not absolutely necessary.


{{{m=(3-1)/(-3-0)=-2/3}}}, the same slope you want for your parallel line.


Generally, formula for slope:  {{{m=(y-v)/(x-u)}}}
{{{y-v=m(x-u)}}}
YOUR specific point that your line contains is (0,9)---------- On another thought, *Slope-Intercept form would be best choice!
{{{highlight(y=-(2/3)x+9)}}}



* Reason I changed the choice of equation form is because the point to be on the sought line is its y-intercept.
-
{{{y=mx+b}}}
m is the slope.
b is the y intercept also expressible as (0,b).