First, we must convert this equation into slope-intercept form.
[tex]2x - 3y = 12\\\\-3y = 2x + 12\\\\y = -\frac{2}{3}x - 4[/tex]
In answer to your question, we now have our equation in slope-intercept form to be able to answer it.
m (or slope) = [tex]-\frac{2}{3}[/tex]
b (or y-intercept) = -4