Using only Statement 1, we know two different points on line a (the x-intercept and the y-intercept), so we can find the slope of line a. Since lines a and b have the same slope, we can therefore find the slope of line b. But we have no idea where line b is, so we can't find its y-intercept.

Using only Statement 2, we know only one point on line b, and it's not the point we're asked to find (the y-intercept). The y-intercept of line b could be anything, depending on the slope of the line.

Using both Statements, we know the slope of line b from Statement 1, and a point on line b from Statement 2, so we know exactly what line b is, and can answer any question about it, so the answer is C.