1. A line passes through the points (-3,-5) and (6,1). The equation of this line can be written in the form Ax+By=C, where A, B,and C are integers with greatest common divisor 1 and A is positive. Find A+B+C.
2. Find the distance between the x-intercept and the x-intercept of the graph of the equation 3x-7y=21.