3x + y = 39 ........ (equation 1)
2x - y = 6 ............(equation 2)
By subtracting equation 1 - equation 2
5x = 45
Therefore, x = 45/5 = 9
To find y, substitute for x in equation 2
2(9) - y = 6
18 - y = 6
y = 18 - 6
y = 12
Therefore, the two numbers are 9 and 12.