The figure on the right shows the intersections of four one-way streets. Complete parts (a) through (c). 170 340 Cars/hr Cars/hr Palm Drive 150 170 Cars/hr Cars/hr 27h Ave 37h Ave Sunset Drive 100 30 Cars/hr Cars/hr 50 170 Cars/hr Cars/hr a. Set up a system of equations that keeps traffic moving. Choose the correct answer below. O A. O B. O C. OD. w+z=320 w+z=50 w+z=510 w +z= 140 w + x =510 w+ x=320 w + x = 140 w + x=50 X- y= 140 x - y =510 x - y=50 x - y=320 y - z= 50 y - z = 140 y -z=320 y - z =510 b. Use Gaussian elimination to solve the system. Select the correct choice below and fill in any answer boxes within your choice. O A. There is one solution. The solution set is . (Simplify your answers.) OB. There are infinitely many solutions. The solution set is ,z } , where z is any real number. (Type expressions using z as the variable.)