Answer:
By rebuilding it to an easier formula.
This formula can be "rebuild" into the regular form of y = a*x + b
We substract 2x from each side of the equation, we then get;
3y = -2x + 12
We then divide everything by 3.
The formula then looks like this;
y = (-2/3 * x) + 12, which you should be able to graph.