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Y = numero de un digito
(1) x + y = 55
(2) x - y = 45
x = 55 - y
x = 45 + y
55 - y = 45 + y
-y - y = 45 -55
-2y = -10
y = -10/-2
y = 5
x - y = 45
x - 5 =45
x = 45 + 5
x = 50
Respuesta:
x = 50
y = 5
50 - 5 = 45