How many solutions for the system of equations 4x + 6y = 12,6x +9y = 18

At 1:00 Both Jonestown and coopervile have the same temperature
Let Jonestown = J and Cooperville = C
Let X = the temperature of both town

Jonestown
=> 1:00 = x
=> 2:00 = x – 10 degrees
=> 3:00 = x – 10 – 8

Cooperville
=> 1:00 = x
=> 2:00 = x – 6
=> 3:00 = x – 6 – 2
Now, which town is colder.
The answer is the Jonestown because the temperature dropped to total of 18 compare to Cooperville which is only 8.