The equation in point intercept form is y = (2/3)x-8 , therefore the slope of the line parallel to this line must be the same since it's parallel. The slope is 2/3. At the point (-3,-7) we substitute and get the following:
-7 = (2/3)(-3) + b ----> - 7 = -2 + b. So b = -5. The equation is y = (2/3)x - 5