And they give us a choice of four equations right over here. So you could pause the video and try to work through it on your own, but I'm about to do it as well. So let's just draw what's going on. That's always a healthy thing to do. So two cars are driving towards an intersection from perpendicular directions. So let's say that this is one car right over here, and it is moving in the x direction towards that intersection, which is right over there. And then you have another car that is moving in the y direction.