consider the line with these parametric equations: x=-3t - 3, y=9t-9, z=3t+2. one set of symmetric equations for this line is (x-3)/-3 = (y+9)/9 = (z-2)/3. another set of symmetric equations for this line is x/1 = (y-q)/b = (z-r)/c what are the values of q, r, b, and c?