Solve the systems of equations. it is necessary to set up the appropriate equations. All numbers are accurate to at least three significant digits.

The average traffic flow (number of vehicles) from noon until 1 p.m. in a certain section of one-way streets in a city is shown in Fig. 5.45. Explain why an analysis of the flow through these intersections is not sufficient to obtain unique values for x, y, and z.

800 Fig. 5.45 300 X y 700 1 z t 400 t 200