In the analysis of traffic flow, a certain city estimates the following situation for the "square" of its downtown district. In the following figure, the arrows indicate the flow of traffic. If represents the number of cars traveling between intersections A and B, represents the number of cars traveling between B and C, the number between C and D, and the number between D and A, we can formulate equations based on the principle that the number of vehicles entering an intersection equals the number leaving it. That is, for intersection A we obtain Formulate equations for the traffic at B, C, and D.

Question

In the analysis of traffic flow, a certain city estimates the following situation for the "square" of its downtown district. In the following figure, the arrows indicate the flow of traffic. If  represents the number of cars traveling between intersections A and B,  represents the number of cars traveling between B and C,  the number between C and D, and  the number between D and A, we can formulate equations based on the principle that the number of vehicles entering an intersection equals the number leaving it. That is, for intersection A we obtain  Formulate equations for the traffic at B, C, and D. ​  ​

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The Answer of In the analysis of traffic flow, a certain city estimates the following situation for the "square" of its downtown district. In the following figure, the arrows indicate the flow of traffic. If  represents the number of cars traveling between intersections A and B,  represents the number of cars traveling between B and C,  the number between C and D, and  the number between D and A, we can formulate equations based on the principle that the number of vehicles entering an intersection equals the number leaving it. That is, for intersection A we obtain  Formulate equations for the traffic at B, C, and D. ​  ​

In the Analysis of Traffic Flow, a Certain City Estimates