Hi. Im drawing a complete blank on this calc problem. Point a moves along the x-axis at the constant rate of 'a' ft/sec while point b moves along the y-axis at the constant rate of 'b' ft/sec. Find how fast the distance between them is changing when A is at the point (x,0)and B is at the point (0, y). I know that dx / dt = a, and dy / dt = b, however Im stuck on where to go afterwards. I drew a graph and thought that the slope would lead me to an answer, but I cant quite figure it out. Since Im looking for the change in distance between the two points I figured that I may have to incorporate the distance formula rather than some formula with slope, however I cant quite figure out how to go about it. Thanks in advance for any help.