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2x + y = 31 (lo sumas +)
3x - y = 14
----------------
5x = 45
x = 9 .....√
Reemplazas "x" en ec 1 o ec 2
2x + y = 31
2(9) + y = 31
18 + y = 31
y = 13 ......√
Compruebas
3x - y = 14
3(9) - 13 = 14
27 - 13 = 14
14 = 14
Rpta: Los números son 9 y 13
2x+y =31
3x- y=14
Sumando las ecuaciones
5x+0=45
X=45/5=9
Despejando y
Y=31-2x
Y=31-18
Y=13