2x - 3y 12

If you mean 2x-3y=12 you... Solve for Y.
Move the -3y over because it has the Y in it. -3y=2x+12
Divide the other side by -3 (2 Divided by -3=0.6 but you will want -2/3)(12 Divided by -3=-4)
Should look like this:Y=-2/3 - 4
The Y Intercept=-4 and the Slope=-2/3 if your doing graphing.