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first city = x
second city = y
0.075x + 0.035y = 465
y = x + 15000
Solve for y
0. y = 15000 + x
Find y
0.075x + 0.035(15000 + x) = 465
0.075x - 525 + 0.035x = 465
0.11x = 465 + 525
0.11x = 60
x = 60/0.11
x = $545.5
y = 15000 - 545.5
y = $14454.5
The charge in the first city was $545.5
The charge on the second city was $14454.5