Resposta :
C = 4,7 + 1,7x
4,7 + 1,7x = 19,15
1,7x = 19,15 - 4,7
1,7x = 14,45
x = 14,45/1,7
x = 8,5km => 8500m
4,7 + 1,7x = 19,15
1,7x = 19,15 - 4,7
1,7x = 14,45
x = 14,45/1,7
x = 8,5km => 8500m