Fly low airlines has three times as many flights out of muddville as does slow roll airlines. together they have 16 flights daily out of the muddville airport. how many flights does each have?

The given information tells us that for every one flight Muddville has, Fly Low airlines will have 3. This means they have a 3:1 ratio
X = fly low airlines flight, Y = muddville airlines flights
3X + Y = 16
3 + 1 = 4
6 + 2 = 8
9 + 3 = 12
12 + 4 = 16
This means in one day, Fly low airport will have 12 flights while Muddville airport will have 4